Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-02-26 07:13 300e81de

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feat(analysis/complex/basic): complex conjugation is a linear isometry (#6436) Complex conjugation is a linear isometry (and various corollaries, eg it is a continuous linear map). Also rewrite the results that re and im are continuous linear maps, to deduce from explicit bounds rather than passing through linear_map.continuous_of_finite_dimensional.

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