Zero-one Schubert polynomials

Zero-one Schubert polynomials
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零一舒伯特多项式

DOI:
10.1007/s00209-020-02544-2
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发表时间:
2020
影响因子:
0.8
通讯作者:
Fink A
Fink A
中科院分区:
数学2区
文献类型:
--
作者:
Fink A

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We prove that ifis a pattern of, then we can express the Schubert polynomialas a monomial times(in reindexed variables) plus a polynomial with nonnegative coefficients. This implies that the set of permutations whose Schubert polynomials have all their coefficients equal to either 0 or 1 is closed under pattern containment. Using Magyar’s orthodontia, we characterize this class by a list of twelve avoided patterns. We also give other equivalent conditions onbeing zero-one. In this case, the Schubert polynomialis equal to the integer point transform of a generalized permutahedron.
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