Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-02-26 13:23 0f1bc2c0

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feat(topology,analysis): any function is continuous/differentiable on a subsingleton (#12293) Also add supporting lemmas about is_o/is_O and the pure filter and drop an unneeded assumption in asymptotics.is_o_const_const_iff.

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