# Formula for curvature of tensor product of connections

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Suppose $E,E'$ are vector bundles over a differential manifold $M$. Suppose $\nabla,\nabla'$ are connections on $E,E'$ respectively. Let $R_\nabla$ denote the Riemann curvature tensor of $\nabla$ and $R_\nabla'$ denote that Riemann curvature tensor of $\nabla'$. Then if $E \otimes E'$ is the tensor product of vector bundles, $\nabla \otimes \nabla'$ is the tensor product of connections, and $R_{\nabla \otimes \nabla'}$ is its Riemann curvature tensor, we have: $R_{\nabla \otimes \nabla'}(X,Y)(s \otimes s') = R_\nabla(X,Y)(s) \otimes s' + s \otimes R_\nabla(X,Y)s'$.
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