Publications [#243918] of Ezra Miller

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Peer-reviewed journal articles published

1. Miller, E. "Cohen-Macaulay quotients of normal semioroup rings via irreducible resolutions." Mathematical Research Letters 9.1 (January, 2002): 117-128. [MR2003a:13015], [math.AC/0110096], [doi]
   (last updated on 2024/04/16)

   Abstract:
   For a radical monomial ideal I in a normal semigroup ring κ[Q], there is a unique minimal irreducible resolution 0 → κ[Q]/I → W̄0 → W̄1 ... by modules W̄i of the form ⊕jk[Fij], where the Fij are (not necessarily distinct) faces of Q. That is, W̄i is a direct sum of quotients of κ[Q] by prime ideals. This paper characterizes Cohen-Macaulay quotients κ[Q]/I as those whose rainimal irreducible resolutions are linear, meaning that W̄i is pure of dimension dim(κ[Q]/I) - i for i ≥ 0. The proof exploits a graded ring-theoretic analogue of the Zeeman spectral sequence [Zee63], thereby also providing a combinatorial topological version involving no commutative algebra. The characterization via linear irreducible resolutions reduces to the Eagon-Reiner theorem [ER98] by Alexander duality when Q = Nd.