Luitzen Egbertus Jan Brouwer, 1881-1966. Dutch philosopher of logic and mathematician. He founded the discipline of topology and the philosophical doctrine of intuitionism. His clash with the arch-mathematician David Hilbert was legendary.
Luitzen Egbertus Jan Brouwer
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Article from the Stanford Encyclopedia of Philosophy, by Mark van Atten. Includes biographical timeline and a summary of Brouwer's intuitionism.