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isomorphism). Using this isomorphism, one can define a cometric. (In coordinates, the matrix defining the cometric is the inverse of the matrix defining the metric...

_{p}(v)=0\right\}.} It can be seen that H is a subbundle of the tangent bundle TR3. A cometric on H is given by projecting vectors to the two-dimensional space spanned...

W.; Mumford, David (2012-03-01). "Sectional Curvature in Terms of the Cometric, with Applications to the Riemannian Manifolds of Landmarks". SIAM J. Imaging...