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Displaying similar documents to “Remark to the comparison of solution properties of Love's equation with those of wave equation”

Norm estimates of discrete Schrödinger operators

Ryszard Szwarc (1998)

Colloquium Mathematicae

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Harper’s operator is defined on 2 ( Z ) by H θ ξ ( n ) = ξ ( n + 1 ) + ξ ( n - 1 ) + 2 cos n θ ξ ( n ) , where θ [ 0 , π ] . We show that the norm of H θ is less than or equal to 2 2 for π / 2 θ π . This solves a conjecture stated in [1]. A general formula for estimating the norm of self-adjoint tridiagonal infinite matrices is also derived.