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Theory and applications of probability and stochastic processes: e.g. central limit theorems, large deviations, stochastic differential equations, models from statistical mechanics, queuing theory.

2 votes

Is a tight finite measure necessarily separately-valued and uniquely determined by its chara...

I decided not to "comment-answer" this question, so other people have duplicated some of my answer in the comments. Since there are several questions, I will separate them and answer them individually …
Robert Furber's user avatar
15 votes
Accepted

Is defining measures as functionals ever insufficiently general in practice?

The first time I taught myself rigorous measure theory, I used the "linear functionals on $C(X)$" approach for compact Hausdorff spaces, so I got first-hand knowledge of where it doesn't work for prob …
Robert Furber's user avatar
2 votes

Properties of measures that are not countably additive but have countably additive null ideals

$\newcommand{\N}{\mathbb{N}}\newcommand{\R}{\mathbb{R}}$There are examples on $\R$ with the Borel $\sigma$-algebra $\mathcal{B}$. We take the null ideal to be the meagre Borel sets $\mathcal{M}$ (the …
Robert Furber's user avatar
4 votes

Is the separability of the space needed in the proof of the Prohorov's theorem?

Separability is not necessary. In fact, tightness of a family of Borel probability measures implies relative compactness in the vague/weak-* topology on any completely regular space. For instance, thi …
Robert Furber's user avatar