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arXiv 1907.03369math.COcs.DM
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单纯复形的能量

The energy of a simplicial complex

Oliver Knill

摘要:

一个有限抽象单纯复形G定义了一个矩阵L,其中如果G中的两个单纯形x,y相交,则L(x,y)=1,如果它们不相交,则L(x,y)=0。这个矩阵总是幺模的,所以L的逆g有整数元素g(x,y)。类似于欧几里得空间上的拉普拉斯算子,这些格林函数项定义了两个单形x,y之间的势能。我们证明了所有矩阵元素g(x,y)之和的总能量等于G的欧拉示性数X(G),且L的正特征值数减去负特征值数等于X(G).

英文摘要:

A finite abstract simplicial complex G defines a matrix L, where L(x,y)=1 if two simplicies x,y in G intersect and where L(x,y)=0 if they don't. This matrix is always unimodular so that the inverse g of L has integer entries g(x,y). In analogy to Laplacians on Euclidean spaces, these Green function entries define a potential energy between two simplices x,y. We prove that the total energy summing all matrix elements g(x,y) is equal to the Euler characteristic X(G) of G and that the number of positive minus the number of negative eigenvalues of L is equal to X(G).

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