Journal of Mathematical Inequalities · Volume 1, Issue 4 Contractions of a numerical semigroup 01-41 Pages 491-501 DOI 10.7153/jmi-01-41 Downloads Short PDF Full PDF PNG Authors J. C. Rosales Keywords numerical semigroup symmetric pseudo-symmetric modular Diophantine inequality Frobenius number singularity degree Subject classes 20M14 13H1