La Classification Mathématique par matières 2000 Mathematics subject Classification 2000 Query : CC = 11B13 05-XX Combinatorics [For finite fields, see 11Txx] 05B10 Difference sets (number-theoretic, group-theoretic, etc.) [See also 11B13] 11-XX Number theory 11B13 Additive bases [See also 05B10] Keyword : Back to the Mathematics Subject Classification (version 2000)