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feat(Algebra/IndZariski): fill basic instances and flatness#27

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feat(Algebra/IndZariski): fill basic instances and flatness#27
chrisflav wants to merge 1 commit intochrisflav:masterfrom
chrisflav-agents:pr/ind-etale

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Proves the following previously sorry'd declarations in Proetale/Algebra/IndZariski.lean:

  • CommAlgCat.isLocalIso R is closed under isomorphisms
  • CommAlgCat.isLocalIso R is closed under finite discrete limits (products)
  • Algebra.IndZariski.prod: ind-Zariski algebras are closed under products
  • Algebra.IndZariski.of_isLocalIso: every local isomorphism is ind-Zariski
  • Module.Flat.of_indZariski: ind-Zariski algebras are flat
  • RingHom.IndZariski.iff_ind_isLocalIso: fixes a rw that needed to be simp only

@chrisflav
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orchestra polish

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