Rings (Algebra) Mathematics 23 Associative rings 21 Associative Rings and Algebras 20 Algebra 13 Modules (Algebra) 12 Group theory 11 Categories (Mathematics) 9 Commutative rings 9 Algebra, Homological 8 Commutative algebra 8 Group Theory and Generalizations 8 Category Theory, Homological Algebra 7 Commutative Rings and Algebras 7 Algebraic fields 5 Geometry, Algebraic 5 Non-associative Rings and Algebras 5 Nonassociative rings 5 Number Theory 5 Number theory 5 Linear and Multilinear Algebras, Matrix Theory 4 Matrix theory 4 Algebraic Geometry 3 Field Theory and Polynomials 3 Field theory (Physics) 3 K-theory 3 Lie groups 3 Topological Groups, Lie Groups 3 Topological groups 3 Algebraic Topology 2