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Let (Xt)t≥0(X_{t})_{t\ge 0}(Xt)t≥0 be a continuous (Ft)t≥0(\mathcal{F}_{t})_{t\ge 0}(Ft)t≥0-martingale on (Ω,F,P)(\Omega,\mathcal{F},P)(Ω,F,P). Assume that ∀ω∈Ω:t↦Xt(ω)\forall\omega\in\Omega: t\mapsto X_{t}(\omega)∀ω∈Ω:t↦Xt(ω) has Variation on R+\mathbb{R}^{+}R+. Then ∀t≥0:Xt=X0 a.s.\forall t\ge 0:X_{t}=X_{0}\text{ a.s.}∀t≥0:Xt=X0 a.s.
Itô Isometry