feat(RingTheory/MvPolynomial/WeightedHomogeneous): sub, eq_zero_of_no_monomials, eq_monomial_of_unique_weight#38909
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PR summary 834e51690bImport changes for modified filesNo significant changes to the import graph Import changes for all files
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…f_no_monomials, eq_monomial_of_unique_weight Adds three weighted-homogeneous API lemmas extracted from the upcoming graded-ring PR (leanprover-community#38813): * `IsWeightedHomogeneous.sub`: difference of weighted-homogeneous polynomials of degree `n` is weighted-homogeneous of degree `n` (mirrors `add`, requires `CommRing R`). * `IsWeightedHomogeneous.eq_zero_of_no_monomials`: a weighted-homogeneous polynomial of degree `n` is zero if no monomial has weight `n`. * `IsWeightedHomogeneous.eq_monomial_of_unique_weight`: a weighted-homogeneous polynomial of degree `n` whose support is concentrated at a single `d₀` equals `monomial d₀ (coeff d₀ φ)`. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Adds three weighted-homogeneous API lemmas extracted from #38813 to keep that PR reviewable:
IsWeightedHomogeneous.sub,eq_zero_of_no_monomials,eq_monomial_of_unique_weight.