German mathematician (1845-1918) who created set theory, which has become a fundamental theory in mathematics. Cantor established the importance of one-to-one correspondence between the members of two sets, defined infinite and well-ordered sets, and proved that the real numbers are more numerous than the natural numbers. ALS in German, one page both sides, 4.5 x 7, January 13, 1907. Handwritten letter to a colleague, in part (translated): "It was a great pleasure for me to read your kind letter from 17/30 December 1906 to learn that the Mathematical Society at the University of Kharkov, of which you are President, did me the great honor of welcoming me on November 12/25 last year to appoint their honorary member. I would ask you to express my sincere thanks to all members of the society. With great interest I will accept the Society's magazine that you have promised me." In fine condition, with two tiny file holes at the top edge.
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