# HH^ZZ ChainComplexMap -- cohomology of a chain complex map

## Synopsis

• Function: cohomology
• Usage:
HH^i f
• Inputs:
• Optional inputs:
• Degree => ..., default value 0,
• Outputs:
• , the i-th cohomology map induced by the chain complex map f

## Description

The command provides the map on the i-th cohomology module induced by a map f of chain complexes.