The International Congress of Mathematicians is the largest conference for the topic of mathematics. It meets once every four years, hosted by the International Mathematical Union.
Georg Cantor (1845–1918)
The 1932 International Congress of Mathematicians in Zürich, Switzerland
The Soviet commemorative stamp for the 1966 Congress in Moscow
Henri Cartan
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Henri Paul Cartan was a French mathematician who made substantial contributions to algebraic topology.
Henri Cartan in 1968
During the "Cartan celebration", at Orsay in 1975.