References etc.
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@ -749,7 +749,8 @@ $2 \rightarrow 1 \rightarrow 4 \rightarrow 2 \rightarrow 5$.
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\index{Kirchhoff's theorem}
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\index{Kirchhoff's theorem}
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\index{spanning tree}
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\index{spanning tree}
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\key{Kirchhoff's theorem} provides a way
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\key{Kirchhoff's theorem}\footnote{G. R. Kirchhoff (1824--1887) was
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a German physicist.} provides a way
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to calculate the number of spanning trees
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to calculate the number of spanning trees
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of a graph as a determinant of a special matrix.
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of a graph as a determinant of a special matrix.
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For example, the graph
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For example, the graph
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