Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-09-29 04:03 d7abdff7

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chore(analysis/normed_space/*): prereqs for #8611 (#9379) The functions abs and norm_sq on are proper. A matrix with entries in a {seminormed group, normed group, normed space} is itself a {seminormed group, normed group, normed space}. An injective linear map with finite-dimensional domain is a closed embedding.

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