RT journal article T1 Union of Sets of Lengths of Numerical Semigroups A1 García García, Juan Ignacio A1 Marín Aragón, Daniel A1 Vigneron Tenorio, Alberto A2 Matemáticas K1 delta-set; non-unique factorization; numerical monoid; numerical semigroup K1 delta-set K1 non-unique factorization K1 numerical monoid K1 numerical semigroup AB Let S = < a(1), ... , a(p)> be a numerical semigroup, let s is an element of S and let Z(s) be its set of factorizations. The set of lengths is denoted by L(s) = {L(x(1), ... , x(p)) vertical bar (x(1), ... , x(p)) is an element of Z(s)}, where L(x(1), ... , x(p)) = x(1) + ... + x(p). The following sets can then be defined: W(n) = {s is an element of S vertical bar there exists x is an element of Z(s) such that L(x) = n}, nu(n) = boolean OR(s is an element of W(n)) L(s) = {l(1) < l(2) < ... < l(r)} and Delta nu(n) = {l(2) l(1), ... , l(r) - l(r-1)}. In this paper, we prove that the function Delta nu : N -> P(N) is almost periodic with period lcm(a(1), a(p)). PB MDPI SN 2227-7390 YR 2020 FD 2020-10 LK http://hdl.handle.net/10498/24081 UL http://hdl.handle.net/10498/24081 LA eng DS Repositorio Institucional de la Universidad de Cádiz RD 21-sep-2026