Almost-structures and structures in Lorentzian manifolds. I. Almost-Hermite- and almost-product- (2×2) -structures

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Abstract
We present a list of the most important almost‐structures which have been found of interest in general relativity, in the null‐bivectors formalism. We discusss some of the relevant properties of such almost‐structures and various new or more or less known results. We also present theorems on the relations between almost‐product‐structures and almost‐Hermitian‐structures.

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