Commit 2021-09-14 04:32 8dffafd2

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feat(topology): one-point compactification of a topological space (#8579) Define alexandroff X to be the one-point compactification of a topological space X and prove some basic lemmas about this definition. Co-authored by: Yury G. Kudryashov urkud@urkud.name

Estimated changes

added theorem alexandroff.coe_eq_coe
added def alexandroff