# Unique continuation

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A question arising by analogy from the theory of **unique continuation** in elliptic equations, and also in control theory, is the following: if is a solution to a nonlinear Schrodinger equation, and and is specified on a domain at two different times , does this uniquely specify the solution everywhere at all other intermediate times?

- For the 1D cubic NLS, with equal to a half-line, and u assumed to vanish on , this is in Zg1997.
- For general NLS with analytic non-linearity, and with u assumed compactly supported, this is in Bo1997b.
- For the complement of a convex cone, and arbitrary NLS of polynomial growth with a bounded potential term, this is in KnPoVe2003
- For in a half-plane, and allowing potentials in various Lebesgue spaces, this is in IonKn-p
- A local unique continuation theorem (asserting that a non-zero solution cannot vanish on an open set) is in Isk1993