Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-11-09 20:59 b75fd415

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feat(analysis/normed_space/basic): the left-regular representation is an isometry for (even non-unital) C⋆-algebras (#16964) This is a key tool to show that the multiplier algebra is a C⋆-algebra.

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