Invariants Algebraic spaces 1 Categories (Mathematics) 1 Characteristic classes 1 Curvature 1 Differential equations, Partial 1 Differential forms 1 Functions, Meromorphic 1 Geometry, Algebraic 1 Geometry, Differential 1 Group actions (Mathematics) 1 Knot theory 1 Linear algebraic groups 1 Modules (Algebra) 1 Moduli theory 1 System analysis 1 Topological spaces 1 Uniform spaces 1