11 lines
292 B
Text
11 lines
292 B
Text
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import logic
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theorem tst {A B C D : Type} {a₁ a₂ : A} {b : B} {c : C} {d : D}
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(H₀ : a₁ = a₂) (H₁ : a₂ == b) (H₂ : b == c) (H₃ : c == d) : d == a₁ :=
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calc d == c : H₃
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... == b : H₂
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... == a₂ : H₁
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... = a₁ : H₀
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print definition tst
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