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arXiv 0910.1491math.GT
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关于映射类群的两个问题

Two questions on mapping class groups

Louis Funar

摘要:

证明了亏格$g$的闭可定向曲面的映射类群$M_g$的中心扩张是剩余有限的。进一步给出了最大$N=N_g$的粗略估计,使得从$M_g$到SU(N)的同态具有有限象.特别地,$M_g$到$SL([\sqrt{g+1}],\C)$的同态具有有限像。这两个结果都来自于映射类群的量子表示的性质。

英文摘要:

We show that central extensions of the mapping class group $M_g$ of the closed orientable surface of genus $g$ by $\Z$ are residually finite. Further we give rough estimates of the largest $N=N_g$ such that homomorphisms from $M_g$ to SU(N) have finite image. In particular, homomorphisms of $M_g$ into $SL([\sqrt{g+1}],\C)$ have finite image. Both results come from properties of quantum representations of mapping class groups.

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