[Merged by Bors] - chore(data/{equiv,set}/basic): image_preimage #5465
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equiv.symm_image_image
: add@[simp]
;equiv.image_preimage
,equiv.preimage_image
: newsimp
lemmas;set.image_preimage_eq
,set.preimage_image_eq
: makes : set _
an explicit argument;function.injective.preimage_image
,function.surjective.image_preimage
: new aliases forset.preimage_image_eq
and
set.image_preimage_eq
with arguments reversedAlso golf a proof about
separated
.