arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2310.09830math.PRcs.NAmath.NA
收藏

凸单调半群的Chernoff型逼近的收敛速率

Convergence rates for Chernoff-type approximations of convex monotone semigroups

Jonas Blessing, Lianzi Jiang, Michael Kupper, Gechun Liang

AI总结:

本文为凸单调半群的Chernoff型逼近建立显式收敛速率,通过半群方法独立于粘性解理论,并推广至无界函数,应用于Nisio半群和凸期望极限定理。

摘要:

我们为凸单调半群的Chernoff型逼近提供了显式的收敛速率,这类半群对有界连续函数$f$具有形式$S(t)f=\lim_{n\to\infty}I(\frac{t}{n})^n f$。在关于一步算子$I(t)$的时间正则性和逼近方案一致性的适当条件下,我们得到对有界Lipschitz连续函数$f$,$\\|S(t)f-I(\frac{t}{n})^n f\\|_\infty\leq cn^{-γ}$,其中$c\geq 0$和$γ>0$被显式确定。此外,映射$t\mapsto S(t)f$是Hölder连续的。这些结果与粘性解的单调逼近方案密切相关,但通过最近发展的Hamilton-Jacobi-Bellman方程的半群方法独立获得,该方法通过其$Γ$-生成元唯一刻画半群。这种不同的方法允许考虑凸而非次线性方程,并且通过用适当的权函数修改范数,结果可以扩展到无界函数。此外,在算子$I(t)$可能具有不同一致性误差的情况下,半群与迭代算子之间误差的上界和下界是对称的。这些抽象结果应用于Nisio半群和凸期望的极限定理。

英文摘要:

We provide explicit convergence rates for Chernoff-type approximations of convex monotone semigroups which have the form $S(t)f=\lim_{n\to\infty}I(\frac{t}{n})^n f$ for bounded continuous functions $f$. Under suitable conditions on the one-step operators $I(t)$ regarding the time regularity and consistency of the approximation scheme, we obtain $\|S(t)f-I(\frac{t}{n})^n f\|_\infty\leq cn^{-γ}$ for bounded Lipschitz continuous functions $f$, where $c\geq 0$ and $γ>0$ are determined explicitly. Moreover, the mapping $t\mapsto S(t)f$ is Hölder continuous. These results are closely related to monotone approximation schemes for viscosity solutions but are obtained independently by following a recently developed semigroup approach to Hamilton-Jacobi-Bellman equations which uniquely characterizes semigroups via their $Γ$-generators. The different approach allows to consider convex rather than sublinear equations and the results can be extended to unbounded functions by modifying the norm with a suitable weight function. Furthermore, up to possibly different consistency errors for the operators $I(t)$, the upper and lower bound for the error between the semigroup and the iterated operators are symmetric. The abstract results are applied to Nisio semigroups and limit theorems for convex expectations.

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。

↑