A Positive Formula for Type A Peterson Schubert Calculus
A Positive Formula for Type A Peterson Schubert Calculus
复制标题
A 型彼得森舒伯特微积分的正公式
DOI:
10.1007/s44007-022-00023-0
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发表时间:
2022
期刊:
影响因子:
--
通讯作者:
Gorbutt, Brent
中科院分区:
文献类型:
--
作者:
Goldin, Rebecca;Gorbutt, Brent
The Peterson variety is a special case of a nilpotent Hessenberg variety, a class of subvarieties ofG/Bthat have appeared in the study of quantum cohomology, representation theory and combinatorics. In type A, the Peterson varietyYis a subvariety of, the set of complete flags in, and comes equipped with an action by a one-dimensional torus subgroupSof a standard torusTthat acts on. Using thePeterson Schubert basisintroduced in Harada and Tymoczko (Proc Lond Math Soc 103(1):40–72, 2011) and obtained by restricting a specific set of Schubert classes fromto, we describe the product structure of the equivariant cohomology. In particular, we show that the product ismanifestly positivein an appropriate sense by providing an explicit, positive, combinatorial formula for its structure constants. A key step in our proof requires a new combinatorial identity of binomial coefficients that generalizes Vandermonde’s identity, and merits independent interest.
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影响因子:
4.9
作者:
T. Chang;T. Skjelbred
通讯作者:
T. Skjelbred
影响因子:
0.7
作者:
Yukiko Fukukawa;M. Harada;M. Masuda
通讯作者:
M. Masuda
DOI:
--
发表时间:
2020
期刊:
影响因子:
--
作者:
Jin Takahashi;Hikaru Yamamoto;桑垣樹;田神慶士;阿部拓;蓮井翔;古賀勇;Ryomei Iwasa and Wataru Kai;Hikaru Yamamoto;桑垣樹;阿部拓;Ade Irma Suriajaya;田神慶士;Wataru Kai;阿部拓;Sho Hasui;Ade Irma Suriajaya;Sho Hasui;田神慶士;山本光;古賀勇;Hiraku Abe;Ade Irma Suriajaya;Ryomei Iwasa and Wataru Kai;Isami Koga;桑垣樹;阿部拓;山本光;古賀勇;Ade Irma Suriajaya;Wataru Kai;古賀勇;Hiraku Abe;桑垣樹;山本光;Takao Yamazaki;Ade Irma Suriajaya;桑垣樹;古賀勇;甲斐亘;Hiraku Abe;Ade Irma Suriajaya;Hiraku Abe
通讯作者:
Hiraku Abe
DOI:
--
发表时间:
2009
期刊:
影响因子:
--
作者:
M. Harada;Julianna Tymoczko
通讯作者:
Julianna Tymoczko
DOI:
10.1007/s00029-007-0038-4
发表时间:
2007
期刊:
Selecta Mathematica
影响因子:
--
作者:
Julianna Tymoczko
通讯作者:
Julianna Tymoczko