4 lines
145 B
Text
4 lines
145 B
Text
#check λ (A : Type) (a b c d : A) (H1 : a = b) (H2 : c = b) (H3 : d = c),
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calc a = b : H1
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... = c : eq.symm H2
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... = d : eq.symm H3
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