#21. Counting Spanning Trees
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Link to Slides · Link to recording: Part 1 and Part 2
Prompts for discussion:
We spent time on the determinant of the Laplacian of a graph here (short of one vertex). Is there a structural interpretation of the determinant of the adjacency matrix? There are some thoughts here.
Graham and Pollak showed that the determinant of the distance matrix of a tree on vertices - the matrix whose each entry is the ordinary graph distance between and -depends only on . In fact, they gave a formula: . I thought this was really neat: the determinant seems to be completely independent of the structure of the tree! 🤯