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arXiv 1105.5572math.COmath.CTmath.QA
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物种中Hopf幺半群的Lagrange定理

Lagrange's Theorem for Hopf Monoids in Species

Marcelo Aguiar, Aaron Lauve

摘要:

继Radford证明了点霍普夫代数的Lagrange定理之后,我们在连通种范畴内证明了霍普夫幺半群的Lagrange定理.作为推论,我们得到了一个Hopf幺半群H的给定亚种K是一个Hopf子幺半群的必要条件:H的任何一个生成级数与K的相应生成级数的商必须具有非负系数。其他推论包括一个必要条件的序列的非负整数是序列的尺寸的一个霍普夫幺半群的形式,某些多项式不等式,和一个集理论的霍普夫幺半群的形式,某些线性不等式。后者表示序列的二项式变换必须是非负的。

英文摘要:

Following Radford's proof of Lagrange's theorem for pointed Hopf algebras, we prove Lagrange's theorem for Hopf monoids in the category of connected species. As a corollary, we obtain necessary conditions for a given subspecies K of a Hopf monoid H to be a Hopf submonoid: the quotient of any one of the generating series of H by the corresponding generating series of K must have nonnegative coefficients. Other corollaries include a necessary condition for a sequence of nonnegative integers to be the sequence of dimensions of a Hopf monoid in the form of certain polynomial inequalities, and of a set-theoretic Hopf monoid in the form of certain linear inequalities. The latter express that the binomial transform of the sequence must be nonnegative.

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