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arXiv 1902.05447math.RTmath.COmath.CTmath.GR
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对应函子与有限性条件

Correspondence functors and finiteness conditions

Serge Bouc, Jacques Thévenaz

摘要:

我们研究有限集的表示论。对应函子是指有限集范畴中的函子与k-模范畴的对应,其中k是交换环。它们具有其他类型的函子所不具备的各种特殊性质。特别地,如果k是域,且F是对应函子,则F是双生成的当且仅当F(X)的维数根据有限集X的基数指数增长。而且,在这种情况下,F实际上具有有限长度。此外,如果k是诺特的,则一个n-生成函子的任何子函子都是n-生成的。

英文摘要:

We investigate the representation theory of finite sets. The correspondence functors are the functors from the category of finite sets and correspondences to the category of k-modules, where k is a commutative ring. They have various specific properties which do not hold for other types of func-tors. In particular, if k is a field and if F is a correspondence functor, then F is finitely generated if and only if the dimension of F (X) grows exponentially in terms of the cardinality of the finite set X. Moreover, in such a case, F has actually finite length. Also, if k is noetherian, then any subfunctor of a finitely generated functor is finitely generated.

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