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Theorems · Theorem · logic and foundations

not_small_cardinal

¬Small.{u, max (u + 1) (v + 1)} Cardinal.{max u v}

The type of cardinals in universe u is not Small.{u}. This is a version of the Burali-Forti paradox.

Defined in
Mathlib.SetTheory.Cardinal.Basic
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Foundations
Depth 73 from the axioms · uses propext, Classical.choice, Quot.sound

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