Duality theory (Mathematics) C*-algebras 2 Linear topological spaces 2 Semigroups 2 Algebra, Homological 1 Algebraic topology 1 Banach spaces 1 Categories (Mathematics) 1 Convergence 1 Crossed products 1 Demand functions (Economic theory) 1 Econometric models 1 Functions 1 Geometry, Algebraic 1 Maxima and minima 1 Measure theory 1 Monotone operators 1 Monotonic functions 1 Piecewise linear topology 1 Potential theory (Mathematics) 1 Quasiconformal mappings 1 Schemes (Algebraic geometry) 1 Semilattices 1 Surgery (Topology) 1 Ultraproducts 1 Vector bundles 1 Von Neumann algebras 1