= Secondary cohomology operation
{wiki=Secondary_cohomology_operation}
Secondary cohomology operations are mathematical constructs in the field of algebraic topology, specifically in the study of cohomology theories. They provide a way to define advanced operations on cohomology groups beyond the primary operations given by the cup product. In general, cohomology operations are mappings that take cohomology classes and produce new classes, reflecting deeper algebraic structures and geometric properties of topological spaces.
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