[Merged by Bors] - feat(topology/algebra/group_with_zero): continuity lemma for division #9959
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* This is a note with some tips how to formulate a continuity (or measurability, differentiability, ...) lemma. * I wanted to write this up after formulating `continuous.strans` in many "wrong" ways before discovering the "right" way. * I think many lemmas are not following this principle, and could be improved in generality and/or convenience by following this advice. * Based on experience from the sphere eversion project. * The note mentions a lemma that will be added in #9959, but I don't think we necessarily have to wait for that PR.
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* This is a note with some tips how to formulate a continuity (or measurability, differentiability, ...) lemma. * I wanted to write this up after formulating `continuous.strans` in many "wrong" ways before discovering the "right" way. * I think many lemmas are not following this principle, and could be improved in generality and/or convenience by following this advice. * Based on experience from the sphere eversion project. * The note mentions a lemma that will be added in #9959, but I don't think we necessarily have to wait for that PR.
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0.filter.tendsto_prod_top_iffwhich is added by [Merged by Bors] - feat(topology/uniform_space): properties of uniform convergence #9958