Singular perturbation of a time-dependent Cauchy problem in a Hilbert space
Singular perturbation of a time-dependent Cauchy problem in a Hilbert space
Let A be a self-adjoint operator, not necessarily bounded, in the Hubert space H, with resolution of the identityLet A be a (possibly unbounded) self-adjoint operator in a Hubert space iϊ, and let E λ be the resolution of the identity for A, so thatoo) be a Borel measurable function …