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Published online by Cambridge University Press: 20 November 2018
Given a Riemannian manifold M, the Riemann tensor R induces the curvature operator on the exterior power
of the tangent space, defined by the formula
where the inner product is defined by
From the symmetries of R, it follows that ρ is self-adjoint and so has only real eigenvalues. R also induces the sectional curvature function K on 2-planes in is
an orthonormal basis of the 2-plane π.