Several graph invariants have been defined and studied, which present applications in nanochemistry, computer networks, and other areas of science. One vastly studied class of the graph invariants is the class of the topological indices, which helps in the studies of chemical, biological, and physical properties of a chemical structure. One recently introduced graph invariant is the face index, which can assist in predicting the energy and the boiling points of the certain chemical structures. In this paper, we drive the analytical closed formulas of face index of silicon carbides , , , and .

中文翻译：

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碳化硅的表面指数

已经定义和研究了几种图形不变量，它们在纳米化学，计算机网络和其他科学领域中都有应用。拓扑索引的类别是一类经过广泛研究的图不变式，它有助于研究化学结构的化学，生物学和物理性质。最近引入的一种图形不变式是面指数，它可以帮助预测某些化学结构的能量和沸点。在本文中，我们驱动碳化硅的面指数的解析封闭式， ， ，和。