Cohomology
SEQUENCES OF ABELIAN GROUPS ATTACHED TO A TOPOLOGICAL SPACE
Cohomology group; Betti cohomology; Singular cohomology; Cohomology theory; Generalized cohomology theory; Cohomology classes; Cohomology class; Extraordinary cohomology theory; Cohomology theories; Cohomology groups; Integral cohomology group; Cochain (algebraic topology); Generalized cohomology theories; Cohomological; Extraordinary cohomology theories; Extraordinary homology theory; Cohomologies; Generalized cohomology; Higher cohomology; Multiplicative cohomology theory; Differential cohomology; Generalized homology theory
In mathematics, specifically in homology theory and algebraic topology, cohomology is a general term for a sequence of abelian groups, usually one associated with a topological space, often defined from a cochain complex. Cohomology can be viewed as a method of assigning richer algebraic invariants to a space than homology.