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Mar 11, 2018 at 18:36 comment added stoch Thank you for your answer, I understood it completely. It's surprising that a paper with a clear error got published in a good journal.
Mar 11, 2018 at 18:33 vote accept stoch
Mar 11, 2018 at 3:06 comment added Iosif Pinelis @stoch : Indeed, Lemma 3.1 in the paper is not correct if $\xi$ is thought of as not depending on $t$ and/or the path. The proof of the lemma is incorrect anyway. However, if $\xi$ is allowed to depend on $t$ and the path and if $Y(\cdot)$ is, not only mean-square continuous but also has continuous paths, then the path-wise mean value theorem obviously holds. On the other hand, if $Y(\cdot)$ is only assumed to be mean-square continuous but not path-wise continuous, then $\xi$ may not exist at all. I have added the relevant details to my answer.
Mar 11, 2018 at 3:04 history edited Iosif Pinelis CC BY-SA 3.0
added 1590 characters in body
Mar 9, 2018 at 21:05 comment added stoch So those results from the paper are not correct, right? Is the conclusion that there is no Mean Value Theorem in the mean square sense for stochastic processes correct?
Mar 9, 2018 at 20:57 history answered Iosif Pinelis CC BY-SA 3.0