Vertex decomposability of complexes associated to forests

Abstract

In this article‎, ‎we discuss the vertex decomposability of three well-studied simplicial complexes associated to forests‎. ‎In particular‎, ‎we show that the bounded degree complex of a forest and the complex of directed trees of a multidiforest is vertex decomposable‎. ‎We then prove that the non-cover complex of a forest is either contractible or homotopy equivalent to a sphere‎. ‎Finally we provide a complete characterization of forests whose non-cover complexes are vertex decomposable‎.

Keywords

• ‎bounded degree complex‎
• ‎non-cover complex‎
• ‎complex of directed trees‎
• ‎vertex decomposable complex‎
• ‎forests