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arXiv 1702.00344math.CVmath.DS
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unit disk的单叶自映射的参数表示和边界不动点

Parametric representations and boundary fixed points of univalent self-maps of the unit disk

Pavel Gumenyuk

摘要:

Loewner参数表示理论中的一个经典结果是:单位圆盘$\mathbb{D}$的所有共形自映射$ϕ$的半群$\mathfrak U_*$可以作为Loewner - Kufarev控制系统$$ \frac{\mathrm{d} w_t}{\mathrm{d} t}=G_t\circ w_t,\quad t\geqslant0,\qquad w_0=\mathsf{id}_{\mathbb{D}}, $$的可达集得到,其中控制函数$t\mapsto G_t\in\mathsf{Hol}(\mathbb{D},\mathbb{C})$形成一个凸锥.本文将这一结果推广到由所有边界正则不动点集包含给定有限集$F\subset\partial\mathbb{D}$的共形$ϕ:\mathbb{D}\to\mathbb{D}$构成的半群$\mathfrak U[F]$,以及由$\mathsf{id}_{\mathbb{D}}$和所有具有指定边界Denjoy - Wolff点$τ\in\partial\mathbb{D}\setminus F$的$ϕ\in\mathfrak U[F]\setminus\{\mathsf{id}_{\mathbb{D}}\}$构成的其子半群$\mathfrak U_τ[F]$.这完成了在[P. Gumenyuk,预印本2016,ArXiv:1603.04043]中启动的研究,其中考虑了内部Denjoy - Wolff点$τ\in\mathbb{D}$的情况。

英文摘要:

A classical result in the theory of Loewner's parametric representation states that the semigroup $\mathfrak U_*$ of all conformal self-maps $ϕ$ of the unit disk $\mathbb{D}$ normalized by $ϕ(0) = 0$ and $ϕ'(0) > 0$ can be obtained as the reachable set of the Loewner - Kufarev control system $$ \frac{\mathrm{d} w_t}{\mathrm{d} t}=G_t\circ w_t,\quad t\geqslant0,\qquad w_0=\mathsf{id}_{\mathbb{D}}, $$ where the control functions $t\mapsto G_t\in\mathsf{Hol}(\mathbb{D},\mathbb{C})$ form a certain convex cone. Here we extend this result to the semigroup $\mathfrak U[F]$ consisting of all conformal $ϕ:\mathbb{D}\to\mathbb{D}$ whose set of boundary regular fixed points contains a given finite set $F\subset\partial\mathbb{D}$ and to its subsemigroup $\mathfrak U_τ[F]$ formed by $\mathsf{id}_{\mathbb{D}}$ and all $ϕ\in\mathfrak U[F]\setminus\{\mathsf{id}_{\mathbb{D}}\}$ with the prescribed boundary Denjoy - Wolff point $τ\in\partial\mathbb{D}\setminus F$. This completes the study launched in [P. Gumenyuk, Preprint 2016, ArXiv:1603.04043], where the case of interior Denjoy - Wolff point $τ\in\mathbb{D}$ was considered.

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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