Ernst Paul Specker (11 February 1920 in Zürich to 10 December 2011 in Zürich) was a Swiss mathematician. Much of his most influential work was on Willard Van Orman Quine's New Foundations, a set theory with a universal set, but he is most famous for the Kochen-Specker theorem in quantum mechanics, which shows that certain types of hidden-variable theories are impossible. He also proved the ordinal partition relation omega squared arrows omega squared and 3, thereby solving a problem of Paul Erdős. He received his doctorate in 1949 from ETH Zürich, where he remained throughout his professional career. His work is documented in a biography at the University of St Andrews, in a 2012 appreciation by Martin Fürer, and in the collection Ernst Specker: Selecta published by Birkhäuser in 1990.
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He also proved the ordinal partition relation ω2 → (ω2, 3)2, thereby solving a problem of Paul Erdős.
Kochen-Specker Theorem (Wikipedia)
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In quantum mechanics, the Kochen-Specker (KS) theorem, also known as the Bell-KS theorem, is a "no-go" theorem proved by John S. Bell in 1966 and by Simon B. Kochen and Ernst Specker in 1967.
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