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Removahedral Congruences versus Permutree Congruences

Removahedral congruences versus permutree congruences
Authors: Albertin, Doriann; Pilaud, Vincent; Ritter, Julian;

Removahedral Congruences versus Permutree Congruences

Abstract

The associahedron is classically constructed as a removahedron, i.e. by deleting inequalities in the facet description of the permutahedron. This removahedral construction extends to all permutreehedra (which interpolate between the permutahedron, the associahedron and the cube). Here, we investigate removahedra constructions for all quotientopes (which realize the lattice quotients of the weak order). On the one hand, we observe that the permutree fans are the only quotient fans realized by a removahedron. On the other hand, we show that any permutree fan can be realized by a removahedron constructed from any realization of the braid fan. Our results finally lead to a complete description of the type cones of the permutree fans.

Country
France
Keywords

Lattice ideals, congruence relations, 52B11, 52B11, 52B12, 03G10, 06B10, 52B12, 004, 510, \(n\)-dimensional polytopes, 03G10, [MATH.MATH-CO] Mathematics [math]/Combinatorics [math.CO], removahedral construction, [MATH.MATH-CO]Mathematics [math]/Combinatorics [math.CO], Special polytopes (linear programming, centrally symmetric, etc.), FOS: Mathematics, Mathematics - Combinatorics, Combinatorics (math.CO), 06B10, Logical aspects of lattices and related structures, permutree fan

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
10
Top 10%
Average
Top 10%
Green
gold