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[Merged by Bors] - feat(analysis/normed_space/spectrum): Prove the Gelfand-Mazur theorem #12787
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This does several things: 1. Moves the division ring lemmas into root namespace 2. Deletes the corresponding lemmas from the normed field namespace 3. Deletes the `normed_field.` references across mathlib
…vision-ring Conflicts resolved with `git diff $(git merge-base HEAD^ origin/master)..HEAD^ -- src/analysis/normed_space/basic.lean | patch src/analysis/normed/normed_field.lean`
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Can you merge master to make the diff shrink? |
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Looks good! bors r+ |
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feat(analysis/normed_space/spectrum): Prove the Gelfand-Mazur theorem
[Merged by Bors] - feat(analysis/normed_space/spectrum): Prove the Gelfand-Mazur theorem
Mar 20, 2022
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Gelfand-Mazur theorem For a complex Banach division algebra, the natural
algebra_map ℂ A
is an algebra isomorphism whose inverse is given by selecting the (unique) element ofspectrum ℂ a
.normed_division_ring
#12132