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Some results on optimal stopping problems for one-dimensional regular diffusions
For a type of employee stock option (ESO) and an American put option with a
barrier, we obtain closed-form formulae for the value functions and provide a
complete characterization for optimal stopping/continuation regions. Some
comparison principles for the critical levels and the value functions are
given. This work is inspired by the characterization of the value functions for
general one-dimensional regular diffusion processes developed in \cite{DK03} by
Dayanik and Karatzas.Comment: 35 page
Pointwise convergence of multiple ergodic averages and strictly ergodic models
By building some suitable strictly ergodic models, we prove that for an
ergodic system , , , the averages converge a.e.
Deriving some results from the construction, for distal systems we answer
positively the question if the multiple ergodic averages converge a.e. That is,
we show that if is an ergodic distal system, and , then multiple ergodic averages converge a.e.Comment: 35 pages, revised version following referees' report
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