We study the Cauchy problem for a nonlinear elliptic equation with data on a piece $${\mathcal {S}}$$ S of the boundary surface $$\partial {\mathcal {X}}$$ ∂ X . By the… Click to show full abstract
We study the Cauchy problem for a nonlinear elliptic equation with data on a piece $${\mathcal {S}}$$ S of the boundary surface $$\partial {\mathcal {X}}$$ ∂ X . By the Cauchy problem is meant any boundary value problem for an unknown function u in a domain $${\mathcal {X}}$$ X with the property that the data on $${\mathcal {S}}$$ S , if combined with the differential equations in $${\mathcal {X}}$$ X , allows one to determine all derivatives of u on $${\mathcal {S}}$$ S by means of functional equations. In the case of real analytic data of the Cauchy problem, the existence of a local solution near $${\mathcal {S}}$$ S is guaranteed by the Cauchy–Kovalevskaya theorem. We discuss a variational setting of the Cauchy problem which always possesses a generalized solution.
               
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