05-00 General reference works (handbooks, dictionaries, bibliographies, etc.) pertaining to combinatorics 28
05B10 Combinatorial aspects of difference sets (number-theoretic, group-theoretic, etc.) [See also 11B13] 1950
05C60 Isomorphism problems in graph theory (reconstruction conjecture, etc.) and homomorphisms (subgraph embedding, etc.) 3865
05C62 Graph representations (geometric and intersection representations, etc.) {For graph drawing, see also 68R10} 3245
05C69 Vertex subsets with special properties (dominating sets, independent sets, cliques, etc.) 10725
05C70 Edge subsets with special properties (factorization, matching, partitioning, covering and packing, etc.) 15060
05D40 Probabilistic methods in extremal combinatorics, including polynomial methods (combinatorial Nullstellensatz, etc.) 814