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Let $G$ be a connected graph on $n$ vertices and $\mathcal{T}$ be the set of all spanning trees of $G$.

Consider the graph whose vertices are the elements of $\mathcal{T}$ and

$T, T' \in \mathcal{T}$ are connected by an edge if $|E(T)\cap E(T')| = n - 2 $

Does this graph have a name?

One can see that the graph is connected. Are any of its other properties known?

Is there any literature on this graph?

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I have seen this called the Tree Graph of $G$. It has been investigated by a lot of authors. For example Cummings proved in "Hamilton circuits in tree graphs" IEEE Trans. Circuit Theory,13(1966), pp.82-90, that this graph is Hamiltonian. Holzmann and Harary generalized this to tree graphs of matroids in "On the Tree Graph of a Matroid".

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Don't know about a name, but for starters see Lovasz "A homology theory for the spanning trees of a graph" http://www.cs.elte.hu/~lovasz/scans/homology-span-tree.pdf

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