Abstract
This paper starts with an observation that two infinite series of simplicial complexes, which a priori do not seem to have anything to do with each other, have the same homotopy type. One series consists of the complexes of directed forests on a double directed string, while the other one consists of Shapiro–Welker models for the spaces of hyperbolic polynomials with a triple root. We explain this coincidence in the more general context by finding an explicit homotopy equivalence between complexes of directed forests on a double directed tree, and doubly disconnecting complexes of a tree.
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Kozlov, D. Directed Trees in a String, Real Polynomials with Triple Roots, and Chain Mails. Discrete Comput Geom 32, 373–382 (2004). https://doi.org/10.1007/s00454-004-2906-4
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DOI: https://doi.org/10.1007/s00454-004-2906-4