Combinatorial geometryCombinatorics -- Designs and configurations -- Difference sets (number-theoretic, group-theoretic, etc.)Combinatorics -- Designs and configurations -- Difference sets (number-theoretic, group-theoretic, etc.).Combinatorics -- Designs and configurations -- Finite geometriesCombinatorics -- Designs and configurations -- Matrices (incidence, Hadamard, etc.)Combinatorics -- Designs and configurations -- Matrices (incidence, Hadamard, etc.).Difference setsDifferenzmengeGeometry -- Finite geometry and special incidence structures -- Affine and projective planesGeometry, differentialGroup theory and generalizations -- Representation theory of groups -- Ordinary representations and charactersKombinatorische GeometrieNumber theoryNumber theory -- Algebraic number theory: global fields -- Algebraic numbers; rings of algebraic integers
