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In mathematics in the branch of differential geometry, the cocurvature of a connection on a manifold is the obstruction to the integrability of the vertical bundle.

## Definition

If M is a manifold and P is a connection on M, that is a vector-valued 1-form on M which is a projection on TM such that PabPbc = Pac, then the cocurvature $\bar{R}_P$ is a vector-valued 2-form on M defined by

$\bar{R}_P(X,Y) = (\operatorname{Id} - P)[PX,PY]$

where X and Y are vector fields on M.

Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Cocurvature — Please support Wikipedia.
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