English

Hochschild polytopes

Combinatorics 2025-06-30 v5

Abstract

The (m,n)(m,n)-multiplihedron is a polytope whose faces correspond to mm-painted nn-trees, and whose oriented skeleton is the Hasse diagram of the rotation lattice on binary mm-painted nn-trees. Deleting certain inequalities from the facet description of the (m,n)(m,n)-multiplihedron, we construct the (m,n)(m,n)-Hochschild polytope whose faces correspond to mm-lighted nn-shades, and whose oriented skeleton is the Hasse diagram of the rotation lattice on unary mm-lighted nn-shades. Moreover, there is a natural shadow map from mm-painted nn-trees to mm-lighted nn-shades, which turns out to define a meet semilattice morphism of rotation lattices. In particular, when m=1m=1, our Hochschild polytope is a deformed permutahedron whose oriented skeleton is the Hasse diagram of the Hochschild lattice.

Keywords

Cite

@article{arxiv.2307.05940,
  title  = {Hochschild polytopes},
  author = {Vincent Pilaud and Daria Poliakova},
  journal= {arXiv preprint arXiv:2307.05940},
  year   = {2025}
}

Comments

35 pages, 28 figures, 7 tables. Version 5: minor corrections

R2 v1 2026-06-28T11:28:09.866Z