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arXiv 1001.4606math.QAmath.RA
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余代数上积分空间的维数

On the dimension of the space of integrals on coalgebras

S. Dăscălescu, C. Năstăsescu, B. Toader

摘要:

本文研究了单右$C$ -余模的内射包络和内射包络,其中$C$是余代数.这是用来给一个简短的证明,并延长结果Iovanov的维数空间的积分余代数。证明了若$C$是右余Frobenius,则对任意有限支撑的左$C$ -余$C$,$C$上的左$C$ -积分空间的维数为$\leq {\rm dim}M$;对任意有限支撑的右$C$ -余$N$,$C$上的右$N$-积分空间的维数为$\geq {\rm dim}N$.若$C$是余代数,讨论了对偶代数$C^*$离半完全代数有多远.一些积分的例子计算关联余代数。

英文摘要:

We study the injective envelopes of the simple right $C$-comodules, and their duals, where $C$ is a coalgebra. This is used to give a short proof and to extend a result of Iovanov on the dimension of the space of integrals on coalgebras. We show that if $C$ is right co-Frobenius, then the dimension of the space of left $M$-integrals on $C$ is $\leq {\rm dim}M$ for any left $C$-comodule $M$ of finite support, and the dimension of the space of right $N$-integrals on $C$ is $\geq {\rm dim}N$ for any right $C$-comodule $N$ of finite support. If $C$ is a coalgebra, it is discussed how far is the dual algebra $C^*$ from being semiperfect. Some examples of integrals are computed for incidence coalgebras.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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