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<div style="font-size:13.3333px"><font face="Times New Roman" size="2"><span style="font-size:16px"><font face="Tahoma" size="2"><span style="font-size:10pt">Sayın Liste Üyeleri,</span></font></span></font></div>
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<div><font face="Tahoma" size="2"><span style="font-size:10pt">GTÜ Matematik Bölümü Seminerleri kapsamında, 6 Kasım Cuma günü saat 14.00'da Fatma ALTUNBULAK AKSU (Çankaya Üniversitesi) GTÜ Matematik Bölümü Seminer Odası'nda bir seminer verecektir. Seminerin
detayları aşağıda olup tüm ilgilenenler davetlidir.</span></font></div>
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<div><font face="Tahoma" size="2"><span style="font-size:10pt">Saygılarımızla,</span></font></div>
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<div><font face="Tahoma" size="2"><span style="font-size:10pt">Dear all,</span></font></div>
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<div><font face="Tahoma" size="2"><span style="font-size:10pt">There will be a seminar in Gebze Technical University (GTU) on 6th of November by Fatma ALTUNBULAK AKSU (CankayaUniversity). </span></font></div>
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<div><font face="Tahoma" size="2"><span style="font-size:10pt">Time and place: At 14.00 in Department of Mathematics, Building I, Auditorium.</span></font></div>
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<div><font face="Tahoma" size="2"><span style="font-size:10pt"><b>Title:</b> Ghost Number of Group Algebras</span></font></div>
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<div><font face="Tahoma" size="2"><span style="font-size:10pt"><b>Abstract:</b> A ghost in the stable module category of a finite group G is a map between modular representations of G, which induces a trivial map on Tate cohomology. The Fredy's generating hypothesis
(GH) for the stable module category of G is the statement that all ghosts between finitely generated kG-modules factor through a projective kG-module. For most p-groups GH fails and the ghost number of the group algebra kG is defined as an invariant which
measures the degree of the failure of GH. Christensen and Wang give conjectural upper and lower bounds for the ghost number of the group algebra of a p-group. We prove the conjecture for most p-groups. We also prove Wang's conjecture on the ghost number of
the group algebra of the quaternion group of order eight. This is a joint work with David J. Green.</span></font></div>
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