16 lines
487 B
Text
16 lines
487 B
Text
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583.lean:31:8: error: 1 unsolved subgoal
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A : Type,
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B : Type,
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s1 : group A,
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s2 : group B,
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f : A → B,
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Hom : is_hom f,
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a : A,
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P : f a⁻¹ * f a = 1
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⊢ f a⁻¹ = (f a)⁻¹
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583.lean:27:8: error: failed to add declaration 'group_hom.hom_map_inv' to environment, value has metavariables
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remark: set 'formatter.hide_full_terms' to false to see the complete term
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λ (A : Type) (B : Type) (s1 : …) (s2 : …) (f : …) (Hom : …) (a : A),
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have P [visible] : …, from …,
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?M_1
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