8 lines
289 B
Text
8 lines
289 B
Text
open tactic
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set_option pp.notation false
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#elab
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λ (A : Type) (a b c d : A) (H₁ : a = b) (H₂ : c = b) (H₃ : d = c),
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have a = c, by do { transitivity, assumption, symmetry, assumption },
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show a = d, by do { transitivity, this ← get_local "this", exact this, symmetry, assumption }
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