The Generalized Wilf Conjecture for generalized numerical monoids

Let n2n\geq 2, and let TT be a generalized numerical monoid (GMS), meaning a complement-finite submonoid of Nn1\mathbb N^{n-1}. Let H(T)=Nn1TH(T)=\mathbb N^{n-1}\setminus T be its hole set. Define

c(T)={aNn1:ab for some bH(T)}c(T)=\left|\{\mathbf a\in\mathbb N^{n-1}:\mathbf a\leq\mathbf b\text{ for some }\mathbf b\in H(T)\}\right|

and

n(T)={aT:ab for some bH(T)},n(T)=\left|\{\mathbf a\in T:\mathbf a\leq\mathbf b\text{ for some }\mathbf b\in H(T)\}\right|,

where ab\mathbf a\leq\mathbf b means coordinatewise inequality, and let e(T)e(T) be the cardinality of a minimal generating set of TT. Generalized Wilf Conjecture. One has

(n1)c(T)e(T)n(T).(n-1)c(T)\leq e(T)n(T).

This conjecture is the commutative generalized numerical-monoid analogue of the Unipotent Wilf Conjecture and is attributed in the paper to Cisto, Delgado, Farrán, Failla, Pérez, and Utano. Its general status is not resolved here.

Sources & referencesView supporting material

Primary source

Mahir Bilen Can and Naufil Sakran, “On Generalized Wilf Conjectures”, arXiv:2306.05530 (2023).

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