Continuation of solutions to systems of partial differential equations (Q1814329)

The author uses the means of transformation operators for the extention of solutions of systems of elliptic and hyperbolic differential equations. A bicontinuous linear operator \(X\) between two spaces is called a transformation operator for the pair of operators \(A=d^ 2/dx^ 2-Q(x)\) and \(B=d^ 2(dx^ 2-R(x))\), if \(AX=XB\).