Arnold's density-profile conjecture for numerical semigroups

From papers

Let dm=(d1,,dm){\bf d}^m=(d_1,\ldots,d_m) be a vector of generators, and let S(dm){\sf S}({\bf d}^m) be the associated numerical semigroup with conductor C(dm){\sf C}({\bf d}^m). For s<C(dm)s<{\sf C}({\bf d}^m), let pm(s)p_m(s) denote the typical density with which the semigroup fills the segment up to ss.

Arnold's density-profile conjecture. Asymptotically for large dm{\bf d}^m, the density at ss is

pm(s)=(sC(dm))m1.p_m(s)=\left(\frac{s}{{\sf C}({\bf d}^m)}\right)^{m-1}.

Consequently, the semigroup occupies one mmth of the segment from 00 to C(dm)1{\sf C}({\bf d}^m)-1, since

0C(dm)pm(s)ds=C(dm)m.\int_0^{{\sf C}({\bf d}^m)}p_m(s)\,ds=\frac{{\sf C}({\bf d}^m)}{m}.

This is Arnold's Conjecture #1999–10 on the typical density profile below the conductor. The supplied text gives no evidence of a resolution, so it remains open.

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Sources & referencesView supporting material

Primary source

Leonid G. Fel, “Arnold's Conjectures on Weak Asymptotics and Statistics of Numerical Semigroups S(d_1,d_2,d_3)”, arXiv:math/0512637 (2005).

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