Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-08-16 08:39 adb6142d

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refactor(topology/algebra/infinite_sum): generalize tsum_zero (#15786) Thanks to @kbuzzard and @b-mehta, it holds whenever is_closed {0}. This is true not just as t2_space as before, but in all t1_space.

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