Which sets are sets of lengths in all numerical monoids?
Volume 118 / 2019
                    
                    
                        Banach Center Publications 118 (2019), 181-192                    
                                        
                        MSC: Primary 20M13; Secondary 20M14.                    
                                        
                        DOI: 10.4064/bc118-12                    
                                    
                                                Abstract
We explicitly determine those sets of nonnegative integers which occur as sets of lengths in all numerical monoids.