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Commit 2022-11-02 17:10 6d8e6ead

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feat(finite_dimensional/subalgebra) : add subalgebra.is_simple_order_of_finrank (#17237) This PR adds some lemma that will be used in the proof (#17285) that two complex embeddings of a field define the same place iff they are equal or complex conjugate, mainly:

  • subalgebra.is_simple_order_of_finrank shows that the only two subalgebras in an algebra of dimension 2 are exactly and

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