arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0704.0065math.AGmath.CO
收藏

李特伍德-理查森多项式

Littlewood-Richardson polynomials

A. I. Molev

摘要:

我们引入一族依赖于参数的无穷序列的对称函数环。这样一个环的一个特殊的基是由舒尔函数的类似物组成的。相应的结构系数是参数的多项式,我们称之为Littlewood-Richardson多项式。通过修改B的早期结果,给出了它们计算的组合规则。萨根和作者。新的规则提供了一个公式,这些多项式是明显的积极意义上的W。格雷姆我们应用这个公式计算产品的等变Schubert类Grassmannian这意味着一个稳定的性质的结构系数。这种展开式的第一个明显的正公式是由A. Knutson和T.道使用组合数学的难题,而稳定性的性质是不明显的,从该公式。我们还在A. L.构造的量子固有子的基础上,用Littlewood-Richardson多项式描述了一般线性李代数的Casimir元代数中的乘法法则. Okounkov和G.奥尚斯基

英文摘要:

We introduce a family of rings of symmetric functions depending on an infinite sequence of parameters. A distinguished basis of such a ring is comprised by analogues of the Schur functions. The corresponding structure coefficients are polynomials in the parameters which we call the Littlewood-Richardson polynomials. We give a combinatorial rule for their calculation by modifying an earlier result of B. Sagan and the author. The new rule provides a formula for these polynomials which is manifestly positive in the sense of W. Graham. We apply this formula for the calculation of the product of equivariant Schubert classes on Grassmannians which implies a stability property of the structure coefficients. The first manifestly positive formula for such an expansion was given by A. Knutson and T. Tao by using combinatorics of puzzles while the stability property was not apparent from that formula. We also use the Littlewood-Richardson polynomials to describe the multiplication rule in the algebra of the Casimir elements for the general linear Lie algebra in the basis of the quantum immanants constructed by A. Okounkov and G. Olshanski.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑