Type-monotonicity conjecture for numerical semigroups

Let n(g,t)n(g,t) denote the number of numerical semigroups of genus gg and type tt. Type-monotonicity conjecture. For each pair of integers satisfying 2tg2\leqslant t\leqslant g,

n(g,t)<n(g+1,t).n(g,t)<n(g+1,t).

This is proposed as a type-refined analogue of the still-open conjecture that n(g)<n(g+1)n(g)<n(g+1) for every g1g\geqslant 1. Its general status is open.

Sources & referencesView supporting material

Primary source

Jonathan Chappelon, Jorge L. Ramírez Alfonsín and Dumitru I. Stamate, “Numerical semigroup tree: type-representation”, arXiv:2507.15006 (2025).

Progress summary

Never refreshed

Nothing recorded yet. Refresh searches the literature and the public web for attempts on this problem, and writes the first summary here.

Solutions 0

No solutions have been posted yet.