Each of the maps of a cochain complex
is known as a coboundary operator.
Each of the maps of a cochain complex
is known as a coboundary operator.
This entry contributed by Margherita Barile
Weisstein, Eric W., with contributions by Margherita Barile. "Coboundary Operator." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/CoboundaryOperator.html