I am a faculty member at the School of Mathematics of
Institute for Research in Fundamental Sciences (IPM),  Tehran, Iran.

Address
       Institute for Research in Fundamental Sciences (IPM),
        P.O. Box 19395-5746,
        Tehran, Iran

Tel.   +98-21-23102112 (office)
         +98-21-22290928 (math school)
         +98-21-22287013, 22287014  (IPM)

Fax    +98-21-22290648

Email  tayfeh-r  ipm   ir