Algebraic closure #1297
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Algebraic closure #1297
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Now this works, and it didn't work previously even with `@` ```lean structure alg_equiv (α β γ : Type*) [comm_ring α] [ring β] [ring γ] [algebra α β] [algebra α γ] extends alg_hom α β γ := ```
What an interesting error |
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I define the algebraic closure, prove it is algebraically closed and define the homomorphism from an algebraic extension into the algebraic closure.
Algebraic closure PR. I have a skeleton of a proof with some self contained sorries (mainly proving various extensions are algebraic, and the existence of various homomorphisms).
I plan to add some more comments to explain properly the approach I took. Some of the names leave a bit to be desired as well. There are also lemmas that belong elsewhere.
There are a lot of instances in this file, that are irrelevant outside of this file. Is there an easy way to limit the scope of an instance to a file as opposed to a section?
Depends on #1296