Commit 2024-10-22 13:55 ac12c873

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chore(Algebra/Polynomial/RingDivision): move lemmas earlier (#18050) Algebra.Polynomial.RingDivision is a bag grab of lemmas with absolutely no running theme. This PR moves two thirds of them to earlier files with no proof change.

Estimated changes

modified theorem Polynomial.degree_mul
modified theorem Polynomial.degree_pow
added theorem Polynomial.isUnit_iff
modified theorem Polynomial.leadingCoeff_mul
modified theorem Polynomial.leadingCoeff_pow
deleted theorem Polynomial.Monic.comp
deleted theorem Polynomial.add_modByMonic
deleted theorem Polynomial.isUnit_iff
deleted theorem Polynomial.natDegree_mul
deleted theorem Polynomial.natDegree_pow
deleted theorem Polynomial.neg_modByMonic
deleted theorem Polynomial.root_mul
deleted theorem Polynomial.sub_modByMonic