The direct limit of the cohomology groups with coefficients in an Abelian group of certain coverings of a topological space.
Čech Cohomology
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Weisstein, Eric W. "Čech Cohomology." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/CechCohomology.html