Theorem (Solution to SDE)
Let (Zt)t≥0 be Rr-valued continuous semimartingale and let F:R+×Rd→Md,r(R) be s.t. ∃k>0 s.t. ∥F(t,x)−F(t,x′)∥≤K∥x−x′∥∀t∈R+,∀x,x′∈Rdand t↦F(t,x) is locally bounded ∀x∈Rd. Consider the SDE dXt=F(t,Xt)dZt,X0=x∈Rd(*)Assume the filtration (Ft)t≥0 satisfies the Usual conditions. Then: ∀x∈R, ∃! up to indistinguishability a continuous (FtZ)t≥0-adapted process (Xt)t≥0 satisfying (∗).