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Nov 2, 2020 at 10:06 comment added user123124 In Karatzas there seems to be an additional assumption of non-negativity of $Y$ i.e the process within the Snell envelope, do you know if this is really necessary? El Karouis process within the Snell envelope does not look non-negative.
Oct 18, 2018 at 10:22 vote accept user123124
Oct 18, 2018 at 9:54 history answered Carlo Beenakker CC BY-SA 4.0