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arXiv 1504.02586math.CO
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辛不变张量的组合学

Combinatorics of symplectic invariant tensors

Martin Rubey, Bruce W. Westbury

摘要:

不变量理论的一个重要问题是描述在群作用下表示不变量的张量幂幂的子空间。根据魏尔的经典,第一个主要(后来:'基本')定理不变理论的国家,所有的不变量是表达在一个有限的数目,其中,而第二个主要定理确定之间的关系,这些基本不变式。在这里,我们提出了一个透明的,组合证明的第二个基本定理的定义表示的辛群Sp(2n)。我们的公式是完全明确的,并提供了一个非常精确的链接(n+1)-非交叉完美匹配,超越了维度计数。作为推论,我们得到了循环筛分现象的一个例子。

英文摘要:

An important problem from invariant theory is to describe the subspace of a tensor power of a representation invariant under the action of the group. According to Weyl's classic, the first main (later: 'fundamental') theorem of invariant theory states that all invariants are expressible in terms of a finite number among them, whereas a second main theorem determines the relations between those basic invariants. Here we present a transparent, combinatorial proof of a second fundamental theorem for the defining representation of the symplectic group Sp(2n). Our formulation is completely explicit and provides a very precise link to (n+1)-noncrossing perfect matchings, going beyond a dimension count. As a corollary, we obtain an instance of the cyclic sieving phenomenon.

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