<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:14px"><div><span></span></div><div></div><div> </div><div class="signature" id="yui_3_16_0_ym18_1_1459425858649_9150"><div id="yui_3_16_0_ym18_1_1459425858649_9149"><font id="yui_3_16_0_ym18_1_1459425858649_9148" color="#0000ff"><font id="yui_3_16_0_ym18_1_1459425858649_9170" color="#000000">HAMDULLAH SEVLI <br></font>ISTANBUL COMMERCE UNIVERSITY <br>FACULTY OF SCIENCES AND ARTS <br>DEPARTMENT OF MATHEMATICS</font> <br><font color="#ff00ff">34672 USKUDAR, ISTANBUL-TURKEY</font></div><div><font color="#ff00ff">TEL: +90 216 5539422 / 2189</font></div><div><font color="#ff00ff">FAX: +90 216 5539172</font></div></div></div></body></html>