Geometry and Combinatorics

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.