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arXiv 1806.03802math.CO
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组合$K$理论中的多项式

Polynomials from combinatorial $K$-theory

Cara Monical, Oliver Pechenik, Dominic Searles

摘要:

本文引入了多项式环的两个新的基,并研究了它们与已知基的关系。第一个基是准Lascoux基,它既是准基的$K$理论变形,又是准Schur基的$K$模拟从准对称多项式到一般多项式的提升.我们给这个quasiLascoux基础的滑动和Lascoux原子基地,以及一个积极的扩展到quasiLascoux基础的Lascoux基础。作为特殊情况,这些展开式首次证明了拟Schur多项式的$K$ -模拟在T. Lam和P. Pylyavskyy。第二个新的基础是K介子基础,一个$K$理论变形的基本粒子基础。我们给出了积极的扩展的滑移和Lascoux原子基地到这个K介子的基础。在整个过程中,我们探讨这些$K$ -类似物之间的关系如何反映它们的同源对应物之间的关系。我们做了几个“交替求和”的计算,暗示了欧拉示性数的计算。

英文摘要:

We introduce two new bases of the ring of polynomials and study their relations to known bases. The first basis is the quasiLascoux basis, which is simultaneously both a $K$-theoretic deformation of the quasikey basis and also a lift of the $K$-analogue of the quasiSchur basis from quasisymmetric polynomials to general polynomials. We give positive expansions of this quasiLascoux basis into the glide and Lascoux atom bases, as well as a positive expansion of the Lascoux basis into the quasiLascoux basis. As a special case, these expansions give the first proof that the $K$-analogues of quasiSchur polynomials expand positively in multifundamental quasisymmetric polynomials of T. Lam and P. Pylyavskyy. The second new basis is the kaon basis, a $K$-theoretic deformation of the fundamental particle basis. We give positive expansions of the glide and Lascoux atom bases into this kaon basis. Throughout, we explore how the relationships among these $K$-analogues mirror the relationships among their cohomological counterparts. We make several 'alternating sum' conjectures that are suggestive of Euler characteristic calculations.

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