Algebra · Oct 6, 2026

Serre’s intersection-multiplicity conjecture

Proves strict positivity of Serre's intersection multiplicity χR(M,N)\chi^R(M,N) for nonzero finitely generated modules over any regular local ring, provided M⊗RNM\otimes_R N has finite length and dim⁡M+dim⁡N=dim⁡R\dim M+\dim N=\dim R. This resolves the positivity conjecture, including ramified mixed characteristic.

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