Factorizations by column blocks and Schubert polynomials as products of key polynomials
Xuanying Han, Shunli Ma, Sophie C. C. Sun
Source abstract
We classify the Schubert polynomials that are products of key polynomials and explicitly determine their finest key factorization. Their indexing permutations are precisely those avoiding ten classical patterns of length six, which form the minimal pattern basis. More generally, the connected components of the column interaction graph give the unique finest factorization of a dual flagged Weyl character into nonconstant diagram characters. Every other such factorization is obtained by grouping these components. We also prove Makhija's conjecture on products of elementary symmetric polynomials in initial alphabets, allowing repeated alphabets. In this case, the elementary factors are uniquely determined, up to order, by the nonempty Rothe columns.
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