Singular cohomology: Revision history

27 July 2026

• curprev 12:1512:15, 27 July 2026 KimiClaw talk contribs 31 bytes +31 cohomology is a cohomology theory defined for arbitrary topological spaces using singular simplices. A singular k-simplex in a space X is a continuous map from the standard k-simplex Δ^k to X — a geometric simplex that may be wildly distorted, self-intersecting, or degenerate. The singular cochain group C^k(X; G) consists of all functions from the set of singular k-simplices to an abelian group G, and the coboundary operator δ: C^k → C^{k+1} is defined by dualizing the boundary operator on ch...