Irreducible decomposition of binomial ideals. (1st April 2016)

• Record Type: Journal Article
• Authors: Kahle, Thomas; Miller, Ezra; O'Neill, Christopher
• Is Part Of: Compositio mathematica. Volume 152:Number 6(2016:Nov.)
• Page Start: 1319
• Page End: 1332
• Publication Date: 2016-04-01
• Subjects: 13C05, -- 05E40, -- 20M25 (primary), -- 05E15, -- 13F99, -- 13A02, -- 13P99 (secondary); binomial ideal, -- irreducible ideal, -- monoid congruence, -- primary decomposition, -- irreducible decomposition, -- mesoprimary decomposition; Mathematics -- Periodicals; 510
• DOI: 10.1112/S0010437X16007272
• Languages: English
• ISSNs: 0010-437X

Abstract

Abstract : Building on coprincipal mesoprimary decomposition [Kahle and Miller, Decompositions of commutative monoid congruences and binomial ideals, Algebra and Number Theory8 (2014), 1297–1364], we combinatorially construct an irreducible decomposition of any given binomial ideal. In a parallel manner, for congruences in commutative monoids we construct decompositions that are direct combinatorial analogues of binomial irreducible decompositions, and for binomial ideals we construct decompositions into ideals that are as irreducible as possible while remaining binomial. We provide an example of a binomial ideal that is not an intersection of irreducible binomial ideals, thus answering a question of Eisenbud and Sturmfels [ Binomial ideals, Duke Math. J.84 (1996), 1–45].