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Results tagged with set-theory
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user 66104
forcing, large cardinals, descriptive set theory, infinite combinatorics, cardinal characteristics, forcing axioms, ultrapowers, measures, reflection, pcf theory, models of set theory, axioms of set theory, independence, axiom of choice, continuum hypothesis, determinacy, Borel equivalence relations, Boolean-valued models, embeddings, orders, relations, transfinite recursion, set theory as a foundation of mathematics, the philosophy of set theory.
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votes
What is the complexity of the winning condition in infinite Hex? In particular, is infinite ...
The complexity is arithmetic, and at most $\Sigma^0_7$.
The proof is based on showing that my counterexample to PyRulez's proposed formula is essentially the only one.
Let $G$ be the set of tiles of t …
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