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arXiv 1702.06282math.PR
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马氏过程的拟鞅

Quasimartingales associated to Markov processes

Lucian Beznea, Iulian Cîmpean

摘要:

对于固定右过程$X$,我们研究了$u(X)$是拟鞅的函数$u$.证明了$u(X)$是拟鞅当且仅当$u$是两个有限过分函数之差.特别是,我们表明,准鞅性质的$u$下保持杀戮,时变,或Bochner从属。该研究依赖于一个解析的拟鞅性质的重新表述为$u(X)$在一定的变化$u$的转移函数的过程。给出了$u(X)$是拟鞅的充分条件,最后,我们推广到对称马氏过程的半狄利克雷形式的半鞅刻画.

英文摘要:

For a fixed right process $X$ we investigate those functions $u$ for which $u(X)$ is a quasimartingale. We prove that $u(X)$ is a quasimartingale if and only if $u$ is the dif- ference of two finite excessive functions. In particular, we show that the quasimartingale nature of $u$ is preserved under killing, time change, or Bochner subordination. The study relies on an analytic reformulation of the quasimartingale property for $u(X)$ in terms of a certain variation of $u$ with respect to the transition function of the process. We provide sufficient conditions under which $u(X)$ is a quasimartingale, and finally, we extend to the case of semi-Dirichlet forms a semimartingale characterization of such functionals for symmetric Markov processes, due to Fukushima.

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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