<div dir="ltr"><div dir="ltr"><p class="MsoNormal" style="margin:0cm 0cm 10pt;line-height:115%;font-size:11pt;font-family:Calibri,"sans-serif"">Dear Colleagues!</p>
<p class="MsoNormal" style="margin:0cm 0cm 10pt;line-height:115%;font-size:11pt;font-family:Calibri,"sans-serif"">You are cordially invited to the Weekly Online Seminar
“Analysis and Applied Mathematics” on</p>
<p class="MsoNormal" style="margin:0cm 0cm 10pt;line-height:115%;font-size:11pt;font-family:Calibri,"sans-serif"">Date: Tuesday, January 18, 2022</p>
<p class="MsoNormal" style="margin:0cm 0cm 10pt;line-height:115%;font-size:11pt;font-family:Calibri,"sans-serif"">Time: 13.00-14.00 (GMT+4, Istanbul) = 10.00-11.00 (Ghent) =
15.00-16.00 (Almaty)</p>
<p class="MsoNormal" style="margin:0cm 0cm 10pt;line-height:115%;font-size:11pt;font-family:Calibri,"sans-serif"">Speaker: Prof. Dr. T.Sh. Kal’menov</p>
<p class="MsoNormal" style="margin:0cm 0cm 10pt;line-height:115%;font-size:11pt;font-family:Calibri,"sans-serif"">Institute of Mathematics and Mathematical Modelling, Almaty,
Kazakhstan</p>
<p class="MsoNormal" style="margin:0cm 0cm 10pt;line-height:115%;font-size:11pt;font-family:Calibri,"sans-serif"">Title: Hadamard's example and solvability of the mixed
Cauchy problem for the multidimensional Gellerstedt equation</p>
<p class="MsoNormal" style="margin:0cm 0cm 10pt;line-height:115%;font-size:11pt;font-family:Calibri,"sans-serif""> </p>
<p class="MsoNormal" style="margin:0cm 0cm 10pt;line-height:115%;font-size:11pt;font-family:Calibri,"sans-serif"">Join Zoom Meeting: <a href="https://us02web.zoom.us/j/6678270445?pwd=SFNmQUIvT0tRaHlDaVYrN3l5bzJVQT09">https://us02web.zoom.us/j/6678270445?pwd=SFNmQUIvT0tRaHlDaVYrN3l5bzJVQT09</a>,
Conference ID: 667 827 0445, Access code: 1</p>
<p class="MsoNormal" style="margin:0cm 0cm 10pt;line-height:115%;font-size:11pt;font-family:Calibri,"sans-serif""> </p>
<p class="MsoNormal" style="margin:0cm 0cm 10pt;line-height:115%;font-size:11pt;font-family:Calibri,"sans-serif"">Abstracts and forthcoming talks can be found on our webpage </p>
<p class="MsoNormal" style="margin:0cm 0cm 10pt;line-height:115%;font-size:11pt;font-family:Calibri,"sans-serif""><a href="https://sites.google.com/view/aam-seminars">https://sites.google.com/view/aam-seminars</a></p>
<p class="MsoNormal" style="margin:0cm 0cm 10pt;line-height:115%;font-size:11pt;font-family:Calibri,"sans-serif"">Kind regards,</p>
<p class="MsoNormal" style="margin:0cm 0cm 10pt;line-height:115%;font-size:11pt;font-family:Calibri,"sans-serif""><b style="font-size:12.8px;font-family:Arial,Helvetica,sans-serif">Prof. Dr. Allaberen Ashyralyev </b><br></p><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div style="font-size:12.8px"><span style="font-size:small"><b>Department of Mathematics, Bahcesehir University, 34353, Istanbul, Turkey</b></span><b style="font-size:12.8px"> and </b><b style="font-size:12.8px">Near East University, Lefkoşa(Nicosia), Mersin 10 Turkey</b></div><div><div style="font-size:12.8px"><span style="font-size:12.8px"><b>Peoples' Friendship University of Russia (RUDN University),</b></span><b style="color:rgb(51,51,51);font-family:arial,helvetica,sans-serif;font-size:13px"> Ul Miklukho Maklaya 6, Moscow 117198, Russian Federation </b></div><div style="font-size:12.8px"><b style="font-size:12.8px">Institute of Mathematics and Mathematical Modelling, 050010, Almaty, Kazakhstan</b></div><div style="font-size:12.8px"><b style="font-size:12.8px">e-mail: <a href="mailto:allaberen.ashyralyev@neu.edu.tr" style="color:rgb(17,85,204)" target="_blank">allaberen.ashyralyev@eng.bau.edu.tr</a> and </b><b style="font-size:12.8px"><a href="mailto:aallaberen@gmail.com" style="color:rgb(17,85,204)" target="_blank">aallaberen@gmail.com</a> </b></div><div style="font-size:12.8px"><b style="font-size:12.8px"> </b><a href="http://akademik.bahcesehir.edu.tr/web/allaberenashyralyev" style="color:rgb(0,86,179);margin:0px;padding:0px;border:0px;font-stretch:inherit;font-size:14px;line-height:inherit;font-family:Roboto,sans-serif;vertical-align:baseline" target="_blank">http://akademik.bahcesehir.edu.tr/web/allaberenashyralyev</a></div><div><p class="MsoNormal"><a href="https://sites.google.com/view/aam-seminars" target="_blank">https://sites.google.com/view/aam-seminars</a></p></div><div><a href="https://content.sciendo.com/view/journals/ejaam/ejaam-overview.xml" target="_blank">https://content.sciendo.com/view/journals/ejaam/ejaam-overview.xml</a><br></div><div><font color="#1155cc"><span style="font-size:12.8px"><b><u><a href="http://icaam-online.org" target="_blank">icaam-online.org</a></u></b></span></font></div></div><div><font color="#1155cc"><span style="font-size:12.8px"><b><a href="https://www.genealogy.math.ndsu.nodak.edu/id.php?id=95872&fChrono=1" target="_blank">https://www.genealogy.math.ndsu.nodak.edu/id.php?id=95872&fChrono=1<br></a></b></span><br></font></div></div></div></div></div></div></div></div></div></div></div></div></div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, 4 Jan 2022 at 11:01, Allaberen Ashyralyev <<a href="mailto:aallaberen@gmail.com">aallaberen@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><p class="MsoNormal" align="center" style="margin:0cm 62.8pt 0.0001pt 14.2pt;text-align:center;line-height:17.05pt;font-size:11pt;font-family:Georgia,"serif""><b><span lang="EN-US" style="font-size:12pt;font-family:"Times New Roman","serif"">Bahçeşehir<span style="letter-spacing:-0.2pt"> </span>University,<span style="letter-spacing:-0.25pt"> </span>Istanbul,<span style="letter-spacing:-0.2pt"> </span>Turkey</span></b></p>
<p class="MsoNormal" align="center" style="margin:0cm 63.95pt 0.0001pt 14.2pt;text-align:center;font-size:11pt;font-family:Georgia,"serif""><b><span lang="EN-US" style="font-size:12pt;font-family:"Times New Roman","serif"">Analysis &
PDE Center, Ghent University, Ghent,
Belgium<span style="letter-spacing:0.05pt"> </span></span></b></p>
<p class="MsoNormal" align="center" style="margin:0cm 63.95pt 0.0001pt 14.2pt;text-align:center;font-size:11pt;font-family:Georgia,"serif""><b><span lang="EN-US" style="font-size:12pt;font-family:"Times New Roman","serif"">Institute<span style="letter-spacing:-0.1pt"> </span>Mathematics &<span style="letter-spacing:-0.15pt"> </span>Math.<span style="letter-spacing:-0.15pt"> </span>Modeling,<span style="letter-spacing:-0.15pt"> </span>Almaty,<span style="letter-spacing:-0.15pt">
</span>Kazakhstan</span></b></p>
<p style="margin:0.4pt 0cm 0.0001pt;font-size:12pt;font-family:Georgia,"serif""><span lang="EN-US" style="font-family:"Times New Roman","serif""> </span></p>
<h2 style="margin:0cm 0cm 0.0001pt 14.2pt;line-height:14.35pt;font-size:14pt;font-family:Georgia,"serif";font-weight:normal;text-decoration-line:underline"><span lang="EN-US" style="font-size:12pt;font-family:"Times New Roman","serif"">Seminar</span><span lang="EN-US" style="font-size:12pt;font-family:"Times New Roman","serif";letter-spacing:-0.15pt"> </span><span lang="EN-US" style="font-size:12pt;font-family:"Times New Roman","serif"">leaders:</span><span lang="EN-US" style="font-size:12pt;font-family:"Times New Roman","serif";text-decoration-line:none"></span></h2>
<h3 style="margin:0cm 163pt 0.0001pt 14.2pt;font-size:13pt;font-family:Georgia,"serif";font-weight:normal"><span lang="EN-US" style="font-size:12pt;font-family:"Times New Roman","serif"">Prof. Allaberen Ashyralyev BAU,
Istanbul),<span style="letter-spacing:-3pt"> </span></span></h3>
<h3 style="margin:0cm 0cm 0.0001pt 14.2pt;font-size:13pt;font-family:Georgia,"serif";font-weight:normal"><span lang="EN-US" style="font-size:12pt;font-family:"Times New Roman","serif"">Prof.<span style="letter-spacing:-0.05pt">
</span>Michael<span style="letter-spacing:-0.1pt"> </span>Ruzhansky<span style="letter-spacing:-0.1pt"> </span>(GU,<span style="letter-spacing:-0.1pt"> </span>Ghent),</span></h3>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt 14.2pt;font-size:11pt;font-family:Georgia,"serif""><span lang="EN-US" style="font-size:12pt;font-family:"Times New Roman","serif"">Prof.<span style="letter-spacing:-0.15pt"> </span>Makhmud<span style="letter-spacing:-0.15pt">
</span>Sadybekov<span style="letter-spacing:-0.15pt"> </span>(IMMM,<span style="letter-spacing:-0.15pt"> </span>Almaty)</span></p>
<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt 14.2pt;font-size:11pt;font-family:Georgia,"serif""><span lang="EN-US" style="font-size:12pt;font-family:"Times New Roman","serif";color:rgb(0,31,95)"> </span></p>
<h2 style="margin:0cm 0cm 0.0001pt 14.2pt;line-height:14.35pt;font-size:14pt;font-family:Georgia,"serif";font-weight:normal;text-decoration-line:underline"><span lang="EN-US" style="font-size:12pt;font-family:"Times New Roman","serif"">Date:
Tuesday, January 11, 2022</span><span lang="EN-US" style="font-size:12pt;font-family:"Times New Roman","serif""></span></h2>
<h2 style="margin:0cm 0cm 0.0001pt 14.2pt;line-height:14.35pt;font-size:14pt;font-family:Georgia,"serif";font-weight:normal;text-decoration-line:underline"><span lang="EN-US" style="font-size:12pt;font-family:"Times New Roman","serif""><span style="text-decoration-line:none"> </span></span></h2>
<h2 style="margin:0cm 0cm 0.0001pt 14.2pt;line-height:14.35pt;font-size:14pt;font-family:Georgia,"serif";font-weight:normal;text-decoration-line:underline"><span lang="EN-US" style="font-size:12pt;font-family:"Times New Roman","serif"">Time:
13.00-14.00 (GMT+4, Istanbul) = 10.00-11.00 (Ghent) = 15.00-16.00 (Almaty)</span><span lang="EN-US" style="font-size:12pt;font-family:"Times New Roman","serif""></span></h2>
<h2 style="margin:0cm 0cm 0.0001pt 14.2pt;line-height:14.35pt;font-size:14pt;font-family:Georgia,"serif";font-weight:normal;text-decoration-line:underline"><span lang="EN-US" style="font-size:12pt;font-family:"Times New Roman","serif""><span style="text-decoration-line:none"> </span></span></h2>
<p class="MsoNormal" style="margin:4pt 25pt 0.0001pt 14.2pt;font-size:11pt;font-family:Georgia,"serif""><u><span lang="EN-US" style="font-size:12pt;font-family:"Times New Roman","serif"">Zoom
link</span></u><span lang="EN-US" style="font-size:12pt;font-family:"Times New Roman","serif"">:
</span><span lang="EN-US"><a href="https://us02web.zoom.us/j/6678270445?pwd=SFNmQUIvT0tRaHlDaVYrN3l5bzJVQT09" target="_blank"><u><span style="font-size:12pt;font-family:"Times New Roman","serif";color:windowtext">https://us02web.zoom.us/j/6678270445?pwd=SFNmQUIvT0tRaH-</span></u></a></span><span lang="EN-US" style="font-size:12pt;font-family:"Times New Roman","serif";letter-spacing:-3.75pt"> </span><span lang="EN-US"><a href="https://us02web.zoom.us/j/6678270445?pwd=SFNmQUIvT0tRaHlDaVYrN3l5bzJVQT09" target="_blank"><u><span style="font-size:12pt;font-family:"Times New Roman","serif";color:windowtext">lDaVYrN3l5bzJVQT09</span></u></a></span><b><span lang="EN-US" style="font-size:12pt;font-family:"Times New Roman","serif"">,<span style="letter-spacing:-0.05pt"> </span>Conference<span style="letter-spacing:-0.15pt"> </span>ID:<span style="letter-spacing:0.05pt"> </span></span></b><span lang="EN-US" style="font-size:12pt;font-family:"Times New Roman","serif"">667<span style="letter-spacing:-0.05pt"> </span>827<span style="letter-spacing:-0.05pt"> </span>0445,
<b>Access<span style="letter-spacing:-0.05pt">
</span>code:<span style="letter-spacing:-0.1pt"> </span></b>1</span></p>
<p class="MsoNormal" style="margin:1.75pt 0cm 0.0001pt;font-size:11pt;font-family:Georgia,"serif""><u><span lang="EN-US" style="font-size:12pt;font-family:"Times New Roman","serif""><span style="text-decoration-line:none"> </span></span></u></p>
<p class="MsoNormal" style="margin:1.75pt 0cm 0.0001pt 14.2pt;font-size:11pt;font-family:Georgia,"serif""><b><u><span lang="EN-US" style="font-size:12pt;font-family:"Times New Roman","serif"">Speaker:</span></u></b></p>
<h1 style="margin:12pt 0cm 0.0001pt 14.2pt;line-height:18.15pt;break-after:avoid;font-size:16pt;font-family:"Calibri Light","sans-serif";color:rgb(46,116,181);font-weight:normal"><b><u><span lang="EN-US" style="font-size:12pt;font-family:"Times New Roman","serif";color:windowtext">Prof. Dr. T.Sh. Kal’menov</span></u></b></h1>
<h2 style="margin:0cm 0cm 0.0001pt 14.2pt;line-height:14.35pt;font-size:14pt;font-family:Georgia,"serif";font-weight:normal;text-decoration-line:underline"><span lang="EN-US" style="font-size:12pt;font-family:"Times New Roman","serif"">Institute
of Mathematics and Mathematical Modeling, Almaty, Kazakhstan</span><span lang="EN-US" style="font-size:12pt;font-family:"Times New Roman","serif""></span></h2>
<h1 style="margin:12pt 0cm 0.0001pt 14.2pt;break-after:avoid;font-size:16pt;font-family:"Calibri Light","sans-serif";color:rgb(46,116,181);font-weight:normal"><b><u><span lang="EN-US" style="font-size:12pt;font-family:"Times New Roman","serif";color:windowtext">Title:</span></u></b><span lang="EN-US" style="font-size:12pt;font-family:"Times New Roman","serif";color:windowtext;letter-spacing:0.5pt"> </span><span lang="EN-US" style="font-size:12pt;font-family:"Times New Roman","serif";color:windowtext">Hadamard's<span style="letter-spacing:0.65pt"> </span>example<span style="letter-spacing:0.55pt">
</span>and<span style="letter-spacing:0.5pt"> </span>solvability<span style="letter-spacing:0.65pt"> </span>of<span style="letter-spacing:0.6pt"> </span>the<span style="letter-spacing:0.55pt"> </span>mixed<span style="letter-spacing:0.55pt"> </span>Cau<span style="letter-spacing:-3.9pt"> </span>chy<span style="letter-spacing:-0.2pt"> </span>problem<span style="letter-spacing:-0.25pt"> </span>for<span style="letter-spacing:-0.2pt"> </span>the<span style="letter-spacing:-0.25pt"> </span>multidimensional<span style="letter-spacing:-0.05pt"> </span>Gellerstedt<span style="letter-spacing:-0.2pt"> </span>equation</span></h1>
<h2 style="margin:0cm 0cm 0.0001pt;line-height:14.35pt;font-size:14pt;font-family:Georgia,"serif";font-weight:normal;text-decoration-line:underline"><span lang="EN-US" style="font-size:12pt;font-family:"Times New Roman","serif""><span style="text-decoration-line:none"> </span></span></h2>
<p style="margin:10.3pt 17.2pt 0.0001pt 9.9pt;text-align:justify;line-height:115%;font-size:12pt;font-family:Georgia,"serif""><b><u><span lang="EN-US" style="font-family:"Times New Roman","serif"">Abstract:</span></u></b><span lang="EN-US" style="font-family:"Times New Roman","serif";letter-spacing:-0.85pt">
</span><span lang="EN-US" style="font-family:"Times New Roman","serif"">In<span style="letter-spacing:-0.4pt"> </span>the<span style="letter-spacing:-0.45pt"> </span>theory<span style="letter-spacing:-0.4pt"> </span>of<span style="letter-spacing:-0.3pt"> </span>partial<span style="letter-spacing:-0.35pt"> </span>differential<span style="letter-spacing:-0.2pt"> </span>equations,<span style="letter-spacing:-0.4pt"> </span>an<span style="letter-spacing:-0.25pt"> </span>example<span style="letter-spacing:-0.25pt">
</span>constructed<span style="letter-spacing:-0.45pt"> </span>by<span style="letter-spacing:-0.4pt"> </span>J.<span style="letter-spacing:-0.4pt"> </span>Hada-<span style="letter-spacing:-2.75pt"> </span>mard,<span style="letter-spacing:-0.5pt">
</span>which<span style="letter-spacing:-0.5pt"> </span>shows<span style="letter-spacing:-0.45pt"> </span>the<span style="letter-spacing:-0.45pt"> </span>instability<span style="letter-spacing:-0.5pt"> </span>of<span style="letter-spacing:-0.45pt"> </span>the<span style="letter-spacing:-0.5pt"> </span>solution<span style="letter-spacing:-0.5pt">
</span>of<span style="letter-spacing:-0.4pt"> </span>the<span style="letter-spacing:-0.55pt"> </span>Cauchy<span style="letter-spacing:-0.5pt"> </span>problem<span style="letter-spacing:-0.5pt"> </span>for<span style="letter-spacing:-0.45pt"> </span>the<span style="letter-spacing:-0.55pt"> </span>Laplace<span style="letter-spacing:-0.35pt">
</span>equa-<span style="letter-spacing:-2.8pt"> </span>tion with respect to
small changes in the initial data, is of great importance. In the works of<span style="letter-spacing:0.05pt"> </span>A.N.Tikhonov, V.Y.Arsenin, M.M.Lavrentiev
and many subsequent papers, this problem is<span style="letter-spacing:0.05pt"> </span>reduced
to integral equations of the first kind by solving the Newton potential,
various regu-<span style="letter-spacing:0.05pt"> </span>larizations of the problem
under consideration are given and its conditional correctness is<span style="letter-spacing:0.05pt"> </span>established.<span style="letter-spacing:-0.4pt"> </span>In<span style="letter-spacing:-0.4pt"> </span>our<span style="letter-spacing:-0.35pt"> </span>previous<span style="letter-spacing:-0.4pt">
</span>work,<span style="letter-spacing:-0.4pt"> </span>a<span style="letter-spacing:-0.45pt"> </span>criterion<span style="letter-spacing:-0.4pt"> </span>for<span style="letter-spacing:-0.35pt"> </span>the<span style="letter-spacing:-0.45pt"> </span>strong<span style="letter-spacing:-0.35pt"> </span>solvability<span style="letter-spacing:-0.45pt"> </span>of<span style="letter-spacing:-0.3pt"> </span>the<span style="letter-spacing:-0.45pt"> </span>Cauchy<span style="letter-spacing:-0.45pt">
</span>problem<span style="letter-spacing:-2.8pt"> </span>for the Laplace
equation was found by the spectral decomposition of the Laplace operator<span style="letter-spacing:0.05pt"> </span>with<span style="letter-spacing:-0.1pt"> </span>a<span style="letter-spacing:-0.05pt"> </span>deviating argument.</span></p>
<p style="margin:0.1pt 17.15pt 0.0001pt 9.9pt;text-align:justify;line-height:115%;font-size:12pt;font-family:Georgia,"serif""><span lang="EN-US" style="font-family:"Times New Roman","serif"">In this
report, we consider a mixed Cauchy problem for two-dimensional and multidimen-<span style="letter-spacing:0.05pt"> </span><span style="letter-spacing:-0.05pt">sional</span><span style="letter-spacing:-0.7pt"> </span><span style="letter-spacing:-0.05pt">degenerate</span><span style="letter-spacing:-0.8pt"> </span><span style="letter-spacing:-0.05pt">Gellerstedst</span><span style="letter-spacing:-0.7pt"> </span><span style="letter-spacing:-0.05pt">equations.</span><span style="letter-spacing:-0.8pt"> </span>Analogs<span style="letter-spacing:-0.7pt">
</span>of<span style="letter-spacing:-0.7pt"> </span>the<span style="letter-spacing:-0.75pt"> </span>Hadamard’s<span style="letter-spacing:-0.65pt"> </span>example<span style="letter-spacing:-0.7pt"> </span>are<span style="letter-spacing:-0.7pt"> </span>constructed<span style="letter-spacing:-2.75pt"> </span>and incorrectness of the solution of the
Cauchy problem for the Gellerstedt equation in two-<span style="letter-spacing:0.05pt"> </span>dimensional<span style="letter-spacing:-0.55pt"> </span>and<span style="letter-spacing:-0.6pt"> </span>multidimensional<span style="letter-spacing:-0.5pt"> </span>cases<span style="letter-spacing:-0.6pt"> </span>is<span style="letter-spacing:-0.6pt"> </span>established.<span style="letter-spacing:1.8pt"> </span>The<span style="letter-spacing:-0.45pt"> </span>condition<span style="letter-spacing:-0.6pt"> </span>of<span style="letter-spacing:-0.5pt"> </span>strong<span style="letter-spacing:-0.55pt"> </span>solvability<span style="letter-spacing:-0.7pt"> </span>of<span style="letter-spacing:-2.8pt"> </span>the<span style="letter-spacing:-0.3pt"> </span>mixed<span style="letter-spacing:-0.25pt"> </span>Cauchy<span style="letter-spacing:-0.25pt"> </span>problem<span style="letter-spacing:-0.15pt">
</span>for<span style="letter-spacing:-0.35pt"> </span>the<span style="letter-spacing:-0.25pt"> </span>multidimensional<span style="letter-spacing:-0.15pt"> </span>Gellerstedt<span style="letter-spacing:-0.15pt"> </span>equation<span style="letter-spacing:-0.25pt"> </span>in<span style="letter-spacing:-0.15pt"> </span>a<span style="letter-spacing:-0.25pt"> </span>cylindrical<span style="letter-spacing:-0.2pt"> </span>do-<span style="letter-spacing:-2.75pt"> </span>main is found.
The proof is based on the spectral properties of the Laplace operator and the<span style="letter-spacing:0.05pt"> </span>properties<span style="letter-spacing:-0.1pt"> </span>of<span style="letter-spacing:0.05pt"> </span>special functions.</span></p>
<p style="margin:0.1pt 17.15pt 0.0001pt 9.9pt;text-align:justify;line-height:115%;font-size:12pt;font-family:Georgia,"serif""><span lang="EN-US" style="font-family:"Times New Roman","serif""> </span></p>
<h2 style="margin:3.75pt 0cm 0.0001pt 9.9pt;font-size:14pt;font-family:Georgia,"serif";font-weight:normal;text-decoration-line:underline"><b><span lang="EN-US" style="font-size:12pt;font-family:"Times New Roman","serif"">Biography:</span></b><b><span lang="EN-US" style="font-size:12pt;font-family:"Times New Roman","serif";text-decoration-line:none"></span></b></h2>
<p style="margin:0.1pt 17.1pt 0.0001pt 9.9pt;text-align:justify;font-size:12pt;font-family:Georgia,"serif""><span lang="EN-US" style="font-family:"Times New Roman","serif"">Tynysbek Kal’menov is
a graduate of the Novosibirsk State University (1969), and a representative of the school of A.V. Bitsadze, the outstanding scientist, the corresponding member of<span style="letter-spacing:0.05pt"> </span>the Academy of Sciences of the USSR. In
1972, he completed his postgraduate studies at the<span style="letter-spacing:0.05pt"> </span>Institute of Mathematics of the Siberian Branch of the Academy
of Sciences of the USSR. In<span style="letter-spacing:0.05pt"> </span>1983, he
defended his doctoral thesis at Moscow State University. In 1989, he was
elected as<span style="letter-spacing:0.05pt"> </span>a<span style="letter-spacing:-0.1pt"> </span>corresponding member<span style="letter-spacing:-0.05pt"> </span>of
the<span style="letter-spacing:-0.15pt"> </span>Academy<span style="letter-spacing:-0.05pt"> </span>of<span style="letter-spacing:-0.05pt"> </span>Sciences<span style="letter-spacing:-0.05pt"> </span>of the<span style="letter-spacing:-0.1pt">
</span>Kazakh SSR.</span></p>
<p style="margin:0.05pt 17.2pt 0.0001pt 9.9pt;text-align:justify;font-size:12pt;font-family:Georgia,"serif""><span lang="EN-US" style="font-family:"Times New Roman","serif"">Tynysbek Kal’menov
worked at the Institute of Mathematics and Mechanics of the Academy<span style="letter-spacing:0.05pt"> </span>of<span style="letter-spacing:-0.4pt"> </span>Sciences<span style="letter-spacing:-0.35pt"> </span>of<span style="letter-spacing:-0.4pt"> </span>the<span style="letter-spacing:-0.5pt"> </span>Kazakh<span style="letter-spacing:-0.45pt">
</span>SSR<span style="letter-spacing:-0.5pt"> </span>(1972-1985).<span style="letter-spacing:-0.4pt"> </span>From<span style="letter-spacing:-0.45pt"> </span>1986<span style="letter-spacing:-0.4pt"> </span>to<span style="letter-spacing:-0.45pt"> </span>1991,<span style="letter-spacing:-0.45pt"> </span>he<span style="letter-spacing:-0.5pt"> </span>was<span style="letter-spacing:-0.45pt"> </span>the<span style="letter-spacing:-0.4pt"> </span>dean<span style="letter-spacing:-0.35pt"> </span>of<span style="letter-spacing:-0.4pt"> </span>the<span style="letter-spacing:-0.5pt"> </span>Faculty<span style="letter-spacing:-2.75pt">
</span>of<span style="letter-spacing:-0.25pt"> </span>Mathematics<span style="letter-spacing:-0.3pt"> </span>of<span style="letter-spacing:-0.2pt"> </span>Al-Farabi<span style="letter-spacing:-0.3pt"> </span>Kazakh<span style="letter-spacing:-0.3pt"> </span>State<span style="letter-spacing:-0.3pt"> </span>University.<span style="letter-spacing:-0.3pt"> </span>From<span style="letter-spacing:-0.25pt"> </span>1991<span style="letter-spacing:-0.35pt"> </span>to<span style="letter-spacing:-0.25pt"> </span>1997,<span style="letter-spacing:-0.3pt"> </span>he<span style="letter-spacing:-0.3pt"> </span>was<span style="letter-spacing:-0.35pt"> </span>the<span style="letter-spacing:-0.3pt"> </span>rector<span style="letter-spacing:-0.35pt"> </span>of<span style="letter-spacing:-2.75pt"> </span>Kazakh<span style="letter-spacing:-0.1pt"> </span>Chemical-Technological University<span style="letter-spacing:-0.05pt"> </span>(Shymkent).</span></p>
<p style="margin:0cm 17.2pt 0.0001pt 9.9pt;text-align:justify;font-size:12pt;font-family:Georgia,"serif""><span lang="EN-US" style="font-family:"Times New Roman","serif"">From<span style="letter-spacing:-0.2pt"> </span>2004<span style="letter-spacing:-0.15pt"> </span>to<span style="letter-spacing:-0.15pt"> </span>2019,<span style="letter-spacing:-0.15pt">
</span>Tynysbek<span style="letter-spacing:-0.1pt"> </span>Kal’menov<span style="letter-spacing:-0.05pt"> </span>was<span style="letter-spacing:-0.1pt"> </span>the<span style="letter-spacing:-0.2pt"> </span>General<span style="letter-spacing:-0.15pt">
</span>Director<span style="letter-spacing:-0.15pt"> </span>of<span style="letter-spacing:-0.1pt"> </span>the<span style="letter-spacing:-0.25pt"> </span>Institute<span style="letter-spacing:-0.15pt"> </span>of<span style="letter-spacing:-0.15pt"> </span>Mathematics
and Mathematical Modeling, he made it one of the leading scientific centres in
the<span style="letter-spacing:0.05pt"> </span>country and the best research
institute in Kazakhstan. Suffice it to say, that in terms of the<span style="letter-spacing:0.05pt"> </span>number of scientific publications (2015-2018)
in international rating journals indexed in the<span style="letter-spacing:-2.75pt"> </span>Web of Science, the Institute of Mathematics and Mathematical
Modeling ranked fourth<span style="letter-spacing:0.05pt"> </span><span style="letter-spacing:-0.05pt">among</span><span style="letter-spacing:-0.7pt"> </span><span style="letter-spacing:-0.05pt">all</span><span style="letter-spacing:-0.5pt"> </span><span style="letter-spacing:-0.05pt">Kazakhstani</span><span style="letter-spacing:-0.45pt"> </span><span style="letter-spacing:-0.05pt">organisations,</span><span style="letter-spacing:-0.6pt"> </span>behind<span style="letter-spacing:-0.45pt">
</span>only<span style="letter-spacing:-0.65pt"> </span>three<span style="letter-spacing:-0.7pt"> </span>large<span style="letter-spacing:-0.75pt"> </span>universities:<span style="letter-spacing:-0.6pt"> </span>Nazarbaev<span style="letter-spacing:-0.5pt">
</span>Univer<span style="letter-spacing:-2.8pt"> </span>sity,<span style="letter-spacing:-0.1pt"> </span>N<span style="letter-spacing:-0.1pt"> </span>Al-Farabi
National<span style="letter-spacing:-0.05pt"> </span>University<span style="letter-spacing:-0.1pt"> </span>and<span style="letter-spacing:-0.05pt"> </span>L.N.<span style="letter-spacing:0.05pt"> </span>Gumilyov<span style="letter-spacing:-0.1pt">
</span>Eurasian<span style="letter-spacing:-0.05pt"> </span>University.</span></p>
<p style="margin:0.05pt 0cm 0.0001pt 9.9pt;text-align:justify;line-height:13.6pt;font-size:12pt;font-family:Georgia,"serif""><span lang="EN-US" style="font-family:"Times New Roman","serif"">Since<span style="letter-spacing:0.3pt"> </span>2019,<span style="letter-spacing:0.2pt"> </span>Tynysbek<span style="letter-spacing:0.4pt"> </span>Kal’menov<span style="letter-spacing:0.25pt">
</span>has<span style="letter-spacing:0.35pt"> </span>been<span style="letter-spacing:0.3pt"> </span>working<span style="letter-spacing:0.25pt"> </span>as<span style="letter-spacing:0.2pt"> </span>the<span style="letter-spacing:0.3pt"> </span>head<span style="letter-spacing:0.15pt"> </span>of<span style="letter-spacing:0.3pt"> </span>the<span style="letter-spacing:0.15pt"> </span>Department<span style="letter-spacing:0.3pt"> </span>of<span style="letter-spacing:0.25pt"> </span>Differ</span>ential<span style="font-family:"Times New Roman","serif";font-size:12pt;letter-spacing:-0.2pt"> </span><span style="font-family:"Times New Roman","serif";font-size:12pt">Equations</span><span style="font-family:"Times New Roman","serif";font-size:12pt;letter-spacing:-0.2pt">
</span><span style="font-family:"Times New Roman","serif";font-size:12pt">of</span><span style="font-family:"Times New Roman","serif";font-size:12pt;letter-spacing:-0.15pt"> </span><span style="font-family:"Times New Roman","serif";font-size:12pt">the</span><span style="font-family:"Times New Roman","serif";font-size:12pt;letter-spacing:-0.25pt"> </span><span style="font-family:"Times New Roman","serif";font-size:12pt">Institute</span><span style="font-family:"Times New Roman","serif";font-size:12pt;letter-spacing:-0.2pt"> </span><span style="font-family:"Times New Roman","serif";font-size:12pt">of</span><span style="font-family:"Times New Roman","serif";font-size:12pt;letter-spacing:-0.2pt"> </span><span style="font-family:"Times New Roman","serif";font-size:12pt">Mathematics</span><span style="font-family:"Times New Roman","serif";font-size:12pt;letter-spacing:-0.2pt"> </span><span style="font-family:"Times New Roman","serif";font-size:12pt">and</span><span style="font-family:"Times New Roman","serif";font-size:12pt;letter-spacing:-0.25pt"> </span><span style="font-family:"Times New Roman","serif";font-size:12pt">Mathematical</span><span style="font-family:"Times New Roman","serif";font-size:12pt;letter-spacing:-0.05pt"> </span><span style="font-family:"Times New Roman","serif";font-size:12pt">Modeling.</span></p>
<p style="margin:0.05pt 17.3pt 0.0001pt 9.9pt;text-align:justify;font-size:12pt;font-family:Georgia,"serif""><span lang="EN-US" style="font-family:"Times New Roman","serif"">In 2013, he was
awarded the State Prize of the Republic of Kazakhstan in the field of science<span style="letter-spacing:0.05pt"> </span>and technology for the series of works “To
the theory of initial-boundary value problems for<span style="letter-spacing:0.05pt"> </span>differential<span style="letter-spacing:-0.05pt"> </span>equations”.</span></p>
<p style="margin:0cm 17.45pt 0.0001pt 9.9pt;text-align:justify;font-size:12pt;font-family:Georgia,"serif""><span lang="EN-US" style="font-family:"Times New Roman","serif"">The main areas of
scientific interests of Academician Tynysbek Kal’menov are differential<span style="letter-spacing:0.05pt"> </span><span style="letter-spacing:-0.05pt">equations,</span><span style="letter-spacing:-0.7pt"> </span><span style="letter-spacing:-0.05pt">mathematical</span><span style="letter-spacing:-0.6pt"> </span><span style="letter-spacing:-0.05pt">physics</span><span style="letter-spacing:-0.6pt"> </span>and<span style="letter-spacing:-0.7pt"> </span>operator<span style="letter-spacing:-0.65pt"> </span>theory.<span style="letter-spacing:-0.7pt">
</span>He<span style="letter-spacing:-0.7pt"> </span>has<span style="letter-spacing:-0.55pt"> </span>obtained<span style="letter-spacing:-0.75pt"> </span>fundamental<span style="letter-spacing:-0.6pt"> </span>scientific<span style="letter-spacing:-2.8pt"> </span>results,<span style="letter-spacing:-0.15pt"> </span>many<span style="letter-spacing:-0.1pt"> </span>of<span style="letter-spacing:-0.1pt"> </span>which
led<span style="letter-spacing:-0.15pt"> </span>to<span style="letter-spacing:-0.15pt"> </span>the<span style="letter-spacing:-0.15pt"> </span>creation<span style="letter-spacing:-0.1pt"> </span>of<span style="letter-spacing:-0.1pt"> </span>new<span style="letter-spacing:-0.05pt"> </span>scientific<span style="letter-spacing:-0.15pt"> </span>directions<span style="letter-spacing:-0.05pt"> </span>in<span style="letter-spacing:0.2pt"> </span>mathematics.</span></p>
<p style="margin:0.05pt 17.15pt 0.0001pt 9.9pt;text-align:justify;font-size:12pt;font-family:Georgia,"serif""><span lang="EN-US" style="font-family:"Times New Roman","serif"">Tynysbek<span style="letter-spacing:-0.35pt"> </span>Kal’menov<span style="letter-spacing:-0.3pt"> </span>has<span style="letter-spacing:-0.35pt"> </span>trained<span style="letter-spacing:-0.45pt"> </span>11<span style="letter-spacing:-0.25pt"> </span>doctors<span style="letter-spacing:-0.35pt"> </span>and<span style="letter-spacing:-0.45pt"> </span>more<span style="letter-spacing:-0.35pt"> </span>than<span style="letter-spacing:-0.3pt"> </span>60<span style="letter-spacing:-0.4pt"> </span>candidates<span style="letter-spacing:-0.35pt">
</span>of<span style="letter-spacing:-0.3pt"> </span>sciences<span style="letter-spacing:-0.4pt"> </span>and<span style="letter-spacing:-0.4pt"> </span>PhD,<span style="letter-spacing:-2.8pt"> </span>has founded a large scientific school on
equations of mixed type and differential operators<span style="letter-spacing:0.05pt"> </span>recognized all over the world. Many of his disciples are major
independent scientists recog-<span style="letter-spacing:0.05pt"> </span>nized<span style="letter-spacing:-0.15pt"> </span>in the<span style="letter-spacing:-0.1pt">
</span>world<span style="letter-spacing:-0.1pt"> </span>of mathematics.</span></p>
<p style="margin:0cm 17pt 0.0001pt 9.9pt;text-align:justify;font-size:12pt;font-family:Georgia,"serif""><span lang="EN-US" style="font-family:"Times New Roman","serif"">He has published over
150 scientific articles, most of which are published in international<span style="letter-spacing:0.05pt"> </span>mathematical<span style="letter-spacing:-0.45pt"> </span>journals,<span style="letter-spacing:-0.45pt"> </span>including<span style="letter-spacing:-0.4pt"> </span>14<span style="letter-spacing:-0.4pt"> </span>articles<span style="letter-spacing:-0.5pt"> </span>published<span style="letter-spacing:-0.5pt">
</span>in<span style="letter-spacing:-0.45pt"> </span>“Doklady<span style="letter-spacing:-0.45pt"> </span>AN<span style="letter-spacing:-0.4pt"> </span>SSSR/<span style="letter-spacing:-0.4pt"> </span>Doklady<span style="letter-spacing:-0.5pt">
</span>Math-<span style="letter-spacing:-2.75pt"> </span>ematics”. In the last
5 years alone (2016-2020), he has published more than 30 articles in<span style="letter-spacing:0.05pt"> </span>scientific journals indexed in the Web of
Science database. To date, Academician Tynysbek<span style="letter-spacing:0.05pt"> </span>Kal’menov<span style="letter-spacing:-0.1pt"> </span>has<span style="letter-spacing:-0.15pt"> </span>a<span style="letter-spacing:-0.15pt"> </span>Hirsch<span style="letter-spacing:-0.15pt"> </span>index<span style="letter-spacing:-0.05pt">
</span>of<span style="letter-spacing:-0.1pt"> </span>18<span style="letter-spacing:-0.2pt"> </span>in<span style="letter-spacing:-0.1pt"> </span>the<span style="letter-spacing:-0.15pt"> </span>Web<span style="letter-spacing:-0.15pt"> </span>of<span style="letter-spacing:-0.1pt"> </span>Science<span style="letter-spacing:-0.15pt">
</span>and<span style="letter-spacing:-0.15pt"> </span>Scopus<span style="letter-spacing:-0.15pt"> </span>databases,<span style="letter-spacing:-0.15pt"> </span>which<span style="letter-spacing:-0.15pt"> </span>is<span style="letter-spacing:-0.1pt"> </span>the<span style="letter-spacing:-2.8pt"> </span>highest<span style="letter-spacing:-0.1pt"> </span>indicator<span style="letter-spacing:-0.05pt">
</span>among<span style="letter-spacing:-0.1pt"> </span>all Kazakhstan<span style="letter-spacing:0.05pt"> </span>mathematicians.</span></p>
<p style="margin:0.1pt 17.15pt 0.0001pt 9.9pt;text-align:justify;line-height:115%;font-size:12pt;font-family:Georgia,"serif""><span lang="EN-US" style="font-family:"Times New Roman","serif""> </span></p>
<h2 style="margin:0cm 0cm 0.0001pt;line-height:14.35pt;font-size:14pt;font-family:Georgia,"serif";font-weight:normal;text-decoration-line:underline"><span lang="EN-US" style="font-size:12pt;font-family:"Times New Roman","serif""><span style="text-decoration-line:none"> </span></span></h2><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div style="font-size:12.8px"><b style="font-size:12.8px">Prof. Dr. Allaberen Ashyralyev </b></div><div style="font-size:12.8px"><span style="font-size:small"><b>Department of Mathematics, Bahcesehir University, 34353, Istanbul, Turkey</b></span><b style="font-size:12.8px"> and </b><b style="font-size:12.8px">Near East University, Lefkoşa(Nicosia), Mersin 10 Turkey</b></div><div><div style="font-size:12.8px"><span style="font-size:12.8px"><b>Peoples' Friendship University of Russia (RUDN University),</b></span><b style="color:rgb(51,51,51);font-family:arial,helvetica,sans-serif;font-size:13px"> Ul Miklukho Maklaya 6, Moscow 117198, Russian Federation </b></div><div style="font-size:12.8px"><b style="font-size:12.8px">Institute of Mathematics and Mathematical Modelling, 050010, Almaty, Kazakhstan</b></div><div style="font-size:12.8px"><b style="font-size:12.8px">e-mail: <a href="mailto:allaberen.ashyralyev@neu.edu.tr" style="color:rgb(17,85,204)" target="_blank">allaberen.ashyralyev@eng.bau.edu.tr</a> and </b><b style="font-size:12.8px"><a href="mailto:aallaberen@gmail.com" style="color:rgb(17,85,204)" target="_blank">aallaberen@gmail.com</a> </b></div><div><b><a href="http://staff.neu.edu.tr/allaberen.ashyralyev/" target="_blank">http://staff.neu.edu.tr/allaberen.ashyralyev/</a></b><br></div><div><a href="https://content.sciendo.com/view/journals/ejaam/ejaam-overview.xml" target="_blank">https://content.sciendo.com/view/journals/ejaam/ejaam-overview.xml</a><br></div><div><font color="#1155cc"><span style="font-size:12.8px"><b><u><a href="http://icaam-online.org" target="_blank">icaam-online.org</a></u></b></span></font></div></div><div><font color="#1155cc"><span style="font-size:12.8px"><b><a href="https://www.genealogy.math.ndsu.nodak.edu/id.php?id=95872&fChrono=1" target="_blank">https://www.genealogy.math.ndsu.nodak.edu/id.php?id=95872&fChrono=1<br></a></b></span><br></font></div></div></div></div></div></div></div></div></div></div></div></div></div></div>
</blockquote></div></div>