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Singular Riemannian structures compatible with $pi $-structures
1969
Canadian mathematical bulletin
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1. Introduction. G. Legrand [l] studied a generalization of the almost complex structures [2] by considering a linear operator J acting on the complexified space of a differentiable manifold V m satisfying a relation of the form J = \ (identity) where X is a nonzero complex constant. Such structures are called TT-structures. A TT-structure is defined on V by the knowledge of two fields, of
doi:10.4153/cmb-1969-092-8
fatcat:z2sfqw6iifbcbaz2kkuhdixs5e