Type: Article
Publication Date: 2013-12-08
Citations: 8
DOI: https://doi.org/10.4169/amer.math.monthly.121.01.005
This paper proves a theorem of de Bruijn that classifies additive systems for the nonnegative integers, that is, families A = (Ai)iεI of sets of nonnegative integers, each set containing 0, such that every nonnegative integer can be written uniquely in the form , with ai ε Ai for all i, and ai ≠for only finitely many i.