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theorems / or_self_idem

Disjunction is idempotent

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Posted about 1 month ago · proven 21 days ago

Theorem & proof · or_self_idem.lean · ✓ verified
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import Mathlib

theorem or_self_idem (p : Prop) : (p  p) ↔ p :=
  Iff.intro (fun h => h.elim id id) Or.inl
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