Let (left(X_{t}, mathscr{F}_{t}ight)_{t geqslant 0}) be a submartingale with continuous paths and (mathscr{F}_{t+}=bigcap_{u>t} mathscr{F}_{u}). Show that (left(X_{t},

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Let \(\left(X_{t}, \mathscr{F}_{t}ight)_{t \geqslant 0}\) be a submartingale with continuous paths and \(\mathscr{F}_{t+}=\bigcap_{u>t} \mathscr{F}_{u}\). Show that \(\left(X_{t}, \mathscr{F}_{t+}ight)_{t \geqslant 0}\) is again a submartingale.

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