A New Strategy for Finding Spanning Trees without Small Degree Stems

For an integer $k\geq 2$, a spanning tree of a graph without vertices of degree from $2$ to $k$ is called a $[2,k]$-ST of the graph. The concept of $[2,k]$-STs is a natural extension of a homeomorphically irreducible spanning tree (or HIST), which is a well-studied graph structure. In this paper, we give a new strategy for finding $[2,k]$-STs. By using the strategy, we refine or extend a known degree-sum condition for the existence of a HIST. Furthermore, we also investigate a degree-product condition for the existence of a $[2,k]$-ST.