Moreno-Frías–Rosales conjecture for numerical semigroup semimodules

For a numerical semigroup SS, let g(S)g(S) denote its genus and, for each rN0r\in\mathbb{N}_0, let

J(S,r):={Δ~Δ is an S-semimodule and g(Δ~)g(S)=r},\mathcal{J}(S,r):=\{\widetilde{\Delta}\mid \Delta\text{ is an }S\text{-semimodule and }g(\widetilde{\Delta})-g(S)=r\},

where Δ~=Δ{0}\widetilde{\Delta}=\Delta\cup\{0\} is the numerical semigroup associated with Δ\Delta. Moreno-Frías–Rosales conjecture. There exists a positive integer nSn_S such that, whenever 0a<bnS0\leq a<b\leq n_S, one has

#J(S,a)#J(S,b),\#\mathcal{J}(S,a)\leq\#\mathcal{J}(S,b),

and, for every positive integer nnSn\geq n_S,

#J(S,n)=#J(S,nS).\#\mathcal{J}(S,n)=\#\mathcal{J}(S,n_S).

The conjecture asserts that the cardinalities of these families are nondecreasing up to a threshold and then stabilize. Its status is not established by the supplied text.

Sources & referencesView supporting material

Primary source

Masahiro Watari, “On a conjecture of Moreno-Frías and Rosales for numerical semigroups”, arXiv:2403.14424 (2024).

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