Green ring of Z/p^e Z equals e-fold tensor product of Green ring of Z/p Z by p-adic expansions, enabling explicit Hilbert-Kunz multiplicity for Fermat quadrics that decreases with characteristic and answers Yoshida's conjecture.
Strong Watanabe-Yoshida conjecture for complete intersections.arXiv e-prints, page arXiv:2506.09019, June 2025
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Hilbert-Kunz multiplicity of quadrics decreases
Green ring of Z/p^e Z equals e-fold tensor product of Green ring of Z/p Z by p-adic expansions, enabling explicit Hilbert-Kunz multiplicity for Fermat quadrics that decreases with characteristic and answers Yoshida's conjecture.