Hermann Weyl
(1885-1955)
Weyl was close to both Albert Einstein and Erwin Schrödinger. From 1913 he was a colleague of Einstein's for a few years at University of Zurich. Around 1921 he had an affair with Schrödinger's wife Anny, while she was caring for an illegitimate daughter of Erwin's.
In his important 1918 essay in the philosophy of mathematics,
Das Kontinuum, Weyl anticipated the intuitionist and constructivist theories of mathematics developed by L. E. J. Brouwer. They believed that mathematics is a "free creation of the human mind," and the idea that only the whole numbers exist, all else in the work of man, just as Einstein saw his work on field theories was an idea that goes beyond the experience of material particles..
Richard Dedekind
References
Notes on the First Chapter of The Continuum: Intension, Extension, and Arithmetism
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