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Commit 2020-06-24 06:13 617b07e0

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feat(uniform_space/separation): add separated_set (#3130) Also add documentation and simplify the proof of separated => t2 and add the converse.

Estimated changes

modified theorem is_closed_diagonal
modified theorem is_closed_of_is_complete
added def is_separated
added theorem is_separated_def'
added theorem is_separated_def
deleted def separated
modified theorem separated_equiv
added theorem separated_iff_t2
added def separated_space
added theorem separation_rel_comap
added theorem univ_separated_iff