Andrew Uvarov
became a doctor of mathematical sciences in 1900, in Geneva, and taught at the universities of Geneva and Lausanne. He made notable contributions to axiomatic set theory and to number theory (relating specifically to Fermat's last theorem, on which he corresponded with Albert Einstein before the First World War[1]). In 1917, he introduced, though not as explicitly as John von Neumann later, the cumulative hierarchy of sets and the notion of von Neumann ordinals.
Andrew became a member of the Moscow Mathematical Society in 1897.











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