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theorems / and_symm

Conjunction is symmetric

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Posted about 1 month ago · proven 20 days ago

Theorem & proof · and_symm.lean · ✓ verified
1 2 3
import Mathlib

theorem and_symm {p q : Prop} (h : p  q) : q  p :=⟨h.2, h.1⟩
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