In page-$13$ of Graph minors. $X$. Obstructions to tree-decomposition, $\gamma(G)$ introduced as maximum size of an edge. What is the definition of size of an edge$?$ I think it may be number of edges that incident on terminals of an edge.
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At the beginning of the section in the paper they let $G$ be a hypergraph. The size of a (hyper)edge is the number of vertices it contains.
answered Dec 16, 2015 at 12:12