26 lines
600 B
Text
26 lines
600 B
Text
constant (A : Type₁)
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constant (hom : A → A → Type₁)
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constant (id : Πa, hom a a)
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structure is_iso [class] {a b : A} (f : hom a b) :=
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(inverse : hom b a)
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open is_iso
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set_option pp.metavar_args true
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set_option pp.purify_metavars false
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definition inverse_id [instance] {a : A} : is_iso (id a) :=
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is_iso.mk (id a) (id a)
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definition inverse_is_iso [instance] {a b : A} (f : hom a b) (H : is_iso f) : is_iso (@inverse a b f H) :=
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is_iso.mk (inverse f) f
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constant a : A
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set_option class.trace_instances true
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definition foo := inverse (id a)
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set_option pp.implicit true
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print definition foo
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