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Increasing process

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An increasing process is a stochastic process...

( X t ) t M {\displaystyle (X_{t})_{t\in M}}

...where the random variables X t {\displaystyle X_{t}} which make up the process are increasing almost surely and adapted:

0 = X 0 X t 1 . {\displaystyle 0=X_{0}\leq X_{t_{1}}\leq \cdots .}

A continuous increasing process is such a process where the set M {\displaystyle M} is continuous.

Consider a stochastic process ( X t ) {\displaystyle (\mathrm {X} _{t})} satisfying X t X s {\displaystyle X_{t}\leq X_{s}}  a.s. for all t s {\displaystyle t\leq s}   My question is: Does there exist a modification X ˘ {\displaystyle {\breve {X}}} of , X {\displaystyle X} which almost surely has increasing sample paths t X ˘ t ( ω ) {\displaystyle t\mapsto {\breve {X}}_{t}(\omega )} ?

References

  1. "Increasing stochastic process". MathOverflow. Retrieved 2023-05-06.


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