lean4-htt/tests/lean/run/specialize2.lean at 6683d1eb911291fe52333cba05abae2f6578c314 - max/lean4-htt - maxgit: wireguard access, git repository.

max/lean4-htt

Leonardo de Moura 5caf1bc692 chore: style

Use `·` instead of `.` for structuring tactics.

2022-03-11 16:12:46 -08:00

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 example : (p → q → False) ↔ (¬ p ∨ ¬ q) := by
   apply Iff.intro
   · intro h
     by_cases hp:p <;> by_cases hq:q
     · specialize h hp hq; contradiction
     · exact Or.inr hq
     · exact Or.inl hp
     · exact Or.inr hq
   · intro
     | Or.inl hnp => intros; contradiction
     | Or.inr hnq => intros; contradiction