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first-order and higher-order logic, model theory, set theory, proof theory, computability theory, formal languages, definability, interplay of syntax and semantics, constructive logic, intuitionism, philosophical logic, modal logic, completeness, Gödel incompleteness, decidability, undecidability, theories of truth, truth revision, consistency.
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Sperner's lemma and Tucker's lemma
Hello, I'm one of the authors of this paper: arXiv:1305.6158 (PDF)
The way I see it, "Sperner's Lemma", as usually stated, is actually the "wrong" version of the theorem. The versions in my paper, w …