Root and weight semigroup rings for signed posets

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Root and weight semigroup rings for signed posets

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Csar, Sebastian Alexander

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2014-08

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Abstract

We consider a pair of semigroups associated to a signed poset, called the root semigroup and the weight semigroup, and their semigroup rings, $\Rprt$ and $\Rpwt$, respectively.Theorem 4.1.5 gives generators for the toric ideal of affine semigroup rings associated to signed posets and, more generally, oriented signed graphs. These are the subrings of Laurent polynomials generated by monomials of the form $t_i^{\pm 1},t_i^{\pm 2},t_i^{\pm 1}t_j^{\pm 1}$. This result appears to be new and generalizes work of~\citet*{BoussicaultFerayLascouxReiner2012},~\citet*{GitlerReyesVillarreal2010} and~\citet{Villarreal1995}. Theorem 4.2.12 shows that strongly planar signed posets $P$ have rings $\Rprt$, $\Rrt{\Pc}$ which are complete intersections, with Corollary 4.2.20 showing how to compute $\Psi_P$ in this case. Theorem 5.2.3 gives a Gr\"obner basis for the toric ideal of $\Rpwt$ in type B, generalizing~\citet*[Proposition 6.4]{FerayReiner2012}. Theorems 5.3.10 and 5.3.21 giving two characterizations (via forbidden subposets versus via inductive constructions) of the situation where this Gr\"obner basis gives a complete intersection presentation for its initial ideal, generalizing~\citet*[Theorems 10.5, 10.6]{FerayReiner2012

Keywords

Semigroups

Signed posets

Toric ideals

Mathematics

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University of Minnesota Ph.D. dissertation. August 2014. Major: Mathematics. Advisor: Victor Reiner. 1 computer file (PDF); viii, 170 pages.

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Csar, Sebastian Alexander. (2014). Root and weight semigroup rings for signed posets. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/167039.

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