Alexander–Spanier cohomology
= Alexander–Spanier cohomology
{wiki=Alexander–Spanier_cohomology}
Alexander–Spanier cohomology is a cohomology theory used in algebraic topology that serves to study topological spaces. It extends the notion of singular cohomology, providing a way to compute topological invariants of spaces whether or not they are nice enough to have a smooth structure. It was introduced by John W. Alexander and Paul Spanier. \#\#\# Definition and Basic Ideas 1.