Kirchhoff's theorem

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What Wikipedia says

In the mathematical field of graph theory, Kirchhoff's theorem or Kirchhoff's matrix tree theorem is a theorem about the number of spanning trees in a graph. It states that this number can be computed as any cofactor of the graph's Laplacian matrix.

Excerpt from the Wikipedia article “Kirchhoff's theorem”, under the CC BY-SA 4.0 license. Read the article on Wikipedia