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Two Kinds of Curvature Operators in Dimension Four

Cao, Xiaodong et al.
arXiv (All) · Papers
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53c21differential-geometry
We prove an invariant identity relating the curvature operators of the first and second kind in dimension four. Under the natural identification $S^2_0\congΛ^+\otimesΛ^-$, the trace-free Ricci tensor contributes through a single commutator term. As a consequence, we relate the curvature operator of
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