Calculus of variations 4 Control theory 3 Ergodic theory 3 Mechanics 3 Associative rings and algebras -- Representation theory of rings and algebras -- Representation theory of rings and algebras 2 Coding theory 2 Cryptography 2 Differential equations 2 Differential equations, Linear 2 Evolution equations 2 Finite fields (Algebra) 2 Geometry, Enumerative 2 Group theory and generalizations -- Linear algebraic groups and related topics -- Linear algebraic groups and related topics 2 Mathematical optimization 2 Number theory 2 Representations of algebras 2 Representations of groups 2 String models 2 Topology 2 Algebraic geometry 1 Algebraic topology -- Classical topics -- Degree, winding number 1 Algebraic topology -- Homology and cohomology theories -- Other homology theories 1 Calculus of variations and optimal control; optimization 1 Combinatorics -- Graph theory -- Games on graphs 1 Combinatorics -- Graph theory -- Graph algorithms 1 Combinatorics -- Graph theory -- Infinite graphs 1 Combinatorics -- Graph theory -- Random graphs 1 Combinatorics -- Graph theory -- Structural characterization of families of graphs 1 Cryptography, computer security 1 Differential equations, mechanics 1