Title: Difference sets
Subjects: Difference sets, Combinatorial geometry, Combinatorics -- Designs and configurations -- Difference sets (number-theoretic, group-theoretic, etc.)., Combinatorics -- Designs and configurations -- Matrices (incidence, Hadamard, etc.)., Combinatorics -- Designs and configurations -- Finite geometries, Number theory -- Algebraic number theory: global fields -- Algebraic numbers; rings of algebraic integers, Group theory and generalizations -- Representation theory of groups -- Ordinary representations and characters, Geometry -- Finite geometry and special incidence structures -- Affine and projective planes, Number theory, Geometry, differential, Differenzmenge, Kombinatorische Geometrie, Combinatorics -- Designs and configurations -- Matrices (incidence, Hadamard, etc.), Combinatorics -- Designs and configurations -- Difference sets (number-theoretic, group-theoretic, etc.)