with Stephen Smale at Berkeley |
with Stephen Smale at Berkeley |
with Henri Cartan in Paris |
with Paul Erdős in Zurich |
with Paul Erdős in Zurich |
with Lars V. Ahlfors at Harvard |
with Jean Dieudonné in Paris |
with Garrett Birkhoff (1st row, first from the left), Andrew M. Gleason (2nd row, third from the left) and other mathematicians at Harvard |
with Vladimir I. Arnold in Paris |
with Serge Lang at Berkeley |
with Friedrich E.P. Hirzebruch in Bonn |
with Israel M. Gelfand (4th from the left) in London |
with Shizuo Kakutani at Yale |
with Jean Leray in Paris |
with Dirk Struik in Massachusetts, USA |
with Dirk Struik in Massachusetts, USA |
with Dragoslav S. Mitrinović (in the middle) and Gradimir V. Milovanović (right) in Belgrade |
with Josip Pečarić in Oberwolfach (MFO), Germany |
with Maxwell Reade in Ann Arbor, Michigan |
with his brother George M. Rassias (left) at U. C. Berkeley |
with Richard Järvinen in Ann Arbor, Michigan |
with A. D. Ioffe (left), J.-P. Penot (2nd from the right) and I. Chrysovergis (1st from the right) in Athens |
with Frank Deutsch in the island of Hydra, Greece |
with Bernd Wegner in Berlin |
with Joseph L. Ullman (left) and George Piranian (right) in Ann Arbor, Michigan |
with Preda Mihăilescu (right) at Goettingen |