Descriptive set theory (Borel + projective)

Layer 0 — Mathematicsin the recursion-theory subtree

Cantor 1880 / Lebesgue 1905 / Luzin 1917 / Suslin 1917. Borel-hierarchy + projective-hierarchy + analytic-coanalytic sets. Determinacy axioms. Bridges recursion + set-theory.

Related concepts

Borel set

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