[Merged by Bors] - feat(topology/homeomorph): add homeomorph.symm_symm
#18551
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I'm surprised we didn't have this lemma.
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I'm surprised we didn't have this lemma.
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I made substantial changes to the proofs. To avoid backporting most of them, in leanprover-community/mathlib#18552 I add `private` to lemmas that are deleted in this PR. Also, I backport `Homeomorph.symm_symm` in leanprover-community/mathlib#18551
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I'm surprised we didn't have this lemma.
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I'm surprised we didn't have this lemma.