Geodesic
Two-step sub-Lorentzian structures and graph surfaces
Izvestiya. Mathematics , Tome 84 (2020) no. 1, pp. 52-94.

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We establish an area formula for graph mappings on two-step sub-Lorentzian structures with an arbitrary number of spatial and temporal directions. In a particular case, we consider an alternative approach that requires no additional smoothness of the mapping from which the graph is constructed.
Keywords: multi-dimensional sub-Lorentzian structure, Lipschitz mapping, intrinsic basis, intrinsic measure, area formula. 
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M. B. Karmanova. Two-step sub-Lorentzian structures and graph surfaces. Izvestiya. Mathematics , Tome 84 (2020) no. 1, pp. 52-94. http://geodesic.mathdoc.fr/item/IM2_2020_84_1_a3/

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