这是我们引向l·尤拉对图论的另一个贡献，即尤拉多面体定理，或简称尤拉公式。
This leads us to another contribution of Leonhard Euler to graph theory, namely Euler's polyhedron theorem or simply Euler's formula.
多面体有限基定理在最优化方法的理论研究与算法设计中起一着重要作用。
The finite basis theorem of polyhedron plays an important part in the theoretical research and the algorithm design of optimization methods.
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