Geometry and Combinatorics: Selected Works of J.J. Seidel

Part 1 Graphs and design: equilateral point sets in elliptic geometry. Strongly regular graphs of L2-type and of triangular type strongly regular graphs with (-1,1,0) adjacency matrix having eigenvalue 3, J.H.van Lint strongly regular graphs derived from combinatorial designs, J.M.Goethals a strongly regular graph derived from the perfect ternary golay code, E.R.Berlekamp and J.H.van Lint spherical codes and design, P.Delsarte and J.M.Goethals graphs related to exceptional root systems, F.C.Bussemaker and D.M.Cvetkovic strongly regular graphs having strongly regular subconstituents, P.J.Cameron and J.M.Goethals. Part 2 Lines with few angles: equiangular lines. A survey of two-graphs, P.W.H.Lemmens the regular two-graph on 276 vertices, J.M.Goethals bounds for systems of lines, and jacobi polynomials, P.Delsarte and J.M.Goethals line graphs, root systems, and elliptic geometry, P.J.Cameron et al two graphs - a second survey, D.E.Taylor. Part 3 Matrices and Forms: orthogonal matrices with zero diagonal. Quasiregular two-distance sets, J.M.Goethals a skew Hadamard matrix of order 36, J.M.Goethals symmetric Hadamard matrices of order 36, F.C.Bussemaker quadratic forms over GF(2). On two-graphs and Shult's characterization of symplectic and orthogonal geometries over GF(2), P.J.Cameron the Krein condition, spherical designs, Norton algebras, and permutation groups, P.J.Cameron and J.M.Goethals. Part 4 Non-euclidean geometry: the congruence order of the elliptic plane, J.Haantjes equi-isoclinic subspaces of Euclidean spaces. Metric problems in elliptic geometry, P.W.H.Lemmens the football, J.M.Goethals discrete hyperbolic geometry, A.Neumaier few distance sets in Rpq, A.Blokhuis remark on Wielandt's visibility theorem, A.Blokhuis.