Abstract
A piecewise constant local martingale $M$ with boundedly many jumps is a uniformly integrable martingale if and only if $M_\infty ^-$ is integrable.
Citation
Johannes Ruf. "Piecewise constant local martingales with bounded numbers of jumps." Electron. Commun. Probab. 22 1 - 5, 2017. https://doi.org/10.1214/17-ECP64
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