具有最小伸缩和Lanneau-Thiffeault多项式的PA映射类
PA mapping classes with minimum dilatation and Lanneau-Thiffeault polynomials
摘要:
自1981年以来,人们已经知道,如果固定一个可定向曲面$S$的亏格$g$,则存在一个实数$λ_{min,g} > 1$,它是$S$的一个PA同态的扩张,并且$S$的每一个其他PA同态都有扩张$\geq λ_{min,g}$。我们将展示一个关于有向图的鲜为人知的定理如何使我们对$λ_{min,g}$有一些了解。
英文摘要:
It has been known since 1981 that if one fixes an orientable surface $S$ of genus $g$, then there is a real number $λ_{min,g} > 1$ that is the dilatation of a pA diffeomorphism of $S$, and every other pA diffeomorphism of $S$ has dilatation $\geq λ_{min,g}$. We will show how a little-known theorem about digraphs gives some insight into $λ_{min,g}$.
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