8 lines
256 B
Text
8 lines
256 B
Text
(a, a)
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d1 : true = true
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def d1 : true = true :=
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new_ax
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(a, a)
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1299.lean:13:8: error: invalid theorem 'd2', theorems should not depend on axioms introduced using tactics (solution: mark theorem as a definition)
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theorem d2 : true = true :=
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[incorrect proof]
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