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Proof for eq_four #207

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Proof for eq_four #207

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3 changes: 2 additions & 1 deletion EasyLean/Basic.lean
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Expand Up @@ -9,4 +9,5 @@ theorem mathd_algebra_513
sorry

theorem eq_four : ∀ a b c d : Nat, a = b → a = d → a = c → c = b := by
sorry
intro a b c d h1 h2 h3
rw [← h3, h1]