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.
Hilbert-Kunz multiplicity of quadrics via Ehrhart theory.arXiv e-prints, page arXiv:2508.17915, August 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.