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Selected answers:
Centralizers of pairs in monoids of self-maps
https://mathoverflow.net/questions/200353/when-do-two-non-degenerate-quadratic-forms-give-rise-to-isomorphic-lie-algebras/
https://mathoverflow.net/questions/255448/a-question-about-subsets-of-plane/255478#255478 (or: how to apply the notion of commensurating action to a plane geometry question);
https://mathoverflow.net/questions/249071/finitely-generated-soluble-groups-with-uncountably-many-maximal-subgroups/
https://mathoverflow.net/questions/243514/example-of-reflective-subcategory-of-groups-whose-reflector-doesnt-preserve-f/
https://mathoverflow.net/questions/208645/divisors-of-p41-of-the-form-kp1/208652#208652
https://mathoverflow.net/questions/160161/infinitely-many-finitely-generated-groups-having-the-same-cayley-graph/160178#160178
https://mathoverflow.net/questions/145615/do-constructible-sets-have-krull-dimension/146350#146350
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