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arXiv 0912.0184math.CO
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组合霍普夫代数中的(1-E)-变换

The (1-E)-transform in combinatorial Hopf algebras

F. Hivert, J. -G. Luque, J. -C. Novelli, J. -Y. Thibon

摘要:

我们将对称函数的自同态推广到几个组合霍普夫代数,使第一个幂和为零,其余的不变。作为字母表的变换,这是(1-E)-变换,其中E是指数字母表,其初等对称函数是e_n=1/n!在非交换对称函数的情况下,我们恢复Schocker的幂等元的无序数[Discr。269(2003),239]。从这些幂等元出发,我们构造了类似于峰代数的下降代数的子代数,并研究了它们的表示论。WQSym的情况导致Solomon-Tits代数的类似子代数。在RISKSym中,对转换的研究归结为统一情况下Tsetlin库的简单解决方案。

英文摘要:

We extend to several combinatorial Hopf algebras the endomorphism of symmetric functions sending the first power-sum to zero and leaving the other ones invariant. As a transformation of alphabets, this is the (1-E)-transform, where E is the exponential alphabet, whose elementary symmetric functions are e_n=1/n!. In the case of noncommutative symmetric functions, we recover Schocker's idempotents for derangement numbers [Discr. Math. 269 (2003), 239]. From these idempotents, we construct subalgebras of the descent algebras analogous to the peak algebras and study their representation theory. The case of WQSym leads to similar subalgebras of the Solomon-Tits algebras. In FQSym, the study of the transformation boils down to a simple solution of the Tsetlin library in the uniform case.

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