The present paper gives an introduction to the theory of association schemes, following Bose-Mesner (1959), Biggs (1974), Delsarte (1973), Bannai-Ito (1984) and Brouwer-Cohen-Neumaier (1989). Apart from definitions and many examples, also several proofs and some problems are included. The paragraphs have the following titles: 1. introduction, 2. Distance regular graphs, 3. Minimal idempotents, 4. A-modules, 5. Representations, 6. Root lattices, 7. Generalizations, 8. References.
|Number of pages||17|
|Journal||Séminaire Lotharingien de Combinatoire|
|Publication status||Published - 1991|