Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-12-24 00:43 f03447fb

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feat(analysis/normed_space): a normed space over a nondiscrete normed field is noncompact (#10994) Register this as an instance for a nondiscrete normed field and for a real normed vector space. Also add is_compact.ne_univ.

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