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47F05 Partial differential operators
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abstract adjoint Akad Amer Anal applications approximation asymptotic author considers author proves Author's summary Banach algebra Banach spaces boundary value problems bounded linear operators bounded operator calculus Chapter Citations closed commuting compact operators complete continuous contraction convergence defined denote differential equations differential operators dilation Dokl edition eigenvalues English summary English translation entire collection ergodic theorem existence finite finite-dimensional fixed point Foias Fredholm functional analysis given Hilbert space inequalities Inst integral equations invariant subspaces inverse ISBN iteration kernel lattice Leningrad locally convex spaces main result mapping Math mathematical matrix measure method multiplicity nonlinear nontrivial numerical range obtained operator equations Operator Theory operators on Hilbert paper perturbation Phys polynomial Proc proof properties Referred representation reviewed individually Russian scattering theory Schrodinger selfadjoint selfadjoint operators semigroup sequence solution space H spectral theory spectrum Sz.-Nagy Szeged tions Toeplitz topological transformation unitary operator Univ vector spaces wave operators