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Jun 17, 2017 at 12:05 comment added Takahiro Waki Beside, even his proof of Galois theory diffinitely include irrational number.
Aug 4, 2010 at 3:27 history edited John Stillwell CC BY-SA 2.5
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Aug 4, 2010 at 1:15 comment added John Stillwell In fact, Brouwer probably used methods (in his proofs of the Brouwer fixed point theorem, invariance of dimension etc.) that he had already opposed in his 1907 thesis. There is a theory that Brouwer did his work in topology to gain reputation, so that he would have a platform from which to launch his intuitionist views. In Kronecker's case, I think it more likely that he developed his finitist views later in life, but I'm not convinced that he held them consistently.
Aug 4, 2010 at 1:05 history edited John Stillwell CC BY-SA 2.5
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Aug 4, 2010 at 0:48 comment added Gerry Myerson Isn't it also the case that Brouwer used methods in his early work that he would reject later in life.
Aug 3, 2010 at 23:54 history answered John Stillwell CC BY-SA 2.5