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Commit 2020-10-10 15:18 c8738cb6

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feat(topology/uniform_space/cauchy): generalize second_countable_of_separable to uniform spaces (#4530) Also generalize is_countably_generated.has_antimono_basis to is_countably_generated.exists_antimono_subbasis and add a few lemmas about bases of the uniformity filter.

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