What is ... a Rough Path?

This page hosts information on Joscha Diehl's talk "What is ... a Rough Path?" at the "What is ...?" seminar. The talk will take place on Friday, December 18, 12:30pm at the BMS Loft in Urania. This talk will help you better understand the BMS Friday talk by Peter Friz, which will start at 2pm.


Consider a R^d valued continuous function on [0,1] that has finite length (i.e. finite variation). One can define integration with respect to such a function via the classical Riemann-Stieltjes integral.

Rough path theory enables us to define integration with respect to functions of infinite length. It turns out that these paths must first be endowed (non-canonically) with more information, which leads to paths not taking values in R^d, but some bigger space (a certain Lie group).

One important area of application is stochastic analysis, where most processes are of infinite variation. Nonetheless this talk will focus on deterministic aspects and aims to be understandable with knowledge of only undergraduate mathematics.



Topic revision: r4 - 04 Jun 2013, MimiTsuruga
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