Associative rings and algebras -- Representation theory of rings and algebras -- Representation theory of rings and algebras 2 Group theory and generalizations -- Linear algebraic groups and related topics -- Linear algebraic groups and related topics 2 Representations of algebras 2 Representations of groups 2 Algebra 1 Algebraic topology -- Classical topics -- Degree, winding number 1 Algebraic topology -- Homology and cohomology theories -- Other homology theories 1 Associative Rings and Algebras 1 Associative rings 1 Commutative Rings and Algebras 1 Commutative algebra 1 Commutative rings 1 Field Theory and Polynomials 1 Field theory (Physics) 1 Group Theory and Generalizations 1 Group theory 1 Group theory and generalizations -- Other generalizations of groups -- Loops, quasigroups 1 Group theory and generalizations -- Other generalizations of groups -- Sets with a single binary operation (groupoids) 1 Group theory and generalizations -- Permutation groups -- General theory for finite groups 1 Knot theory 1 Low-dimensional topology 1 Manifolds and cell complexes -- Low-dimensional topology -- Fundamental group, presentations, free differential calculus 1 Manifolds and cell complexes -- Low-dimensional topology -- Invariants of knots and 3-manifolds 1 Manifolds and cell complexes -- Low-dimensional topology -- Knots and links in $S^3$ 1 Manifolds and cell complexes -- PL-topology -- Knots and links (in high dimensions) 1 Non-associative Rings and Algebras 1 Nonassociative rings 1 Number Theory 1 Number theory 1 Rings (Algebra) 1