Felix Bernstein born. In 1895 or 1896, while still a Gymnasium student, he volunteered to read the proofs of a paper of Georg Cantor on set theory. In the process of doing this the idea came to him one morning while shaving of how to prove what is now called the Cantor-Bernstein theorem: If each of two sets is equivalent to a subset of the other, then they are equivalent.
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Felix Bernstein