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.

中文翻译：

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两步亚洛伦兹结构和图面

我们建立了具有任意数量的时空方向的两步次Lorentzian结构上的图形映射的面积公式。在特定情况下，我们考虑了另一种方法，该方法不需要从中构造图的映射具有额外的平滑度。