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Published online by Cambridge University Press: 22 January 2016
The purpose of the present paper is to give a complete proof of the theorem which will be used in a paper of the second author [4].
We will discuss certain spectral properties of selfadjoint ordinary differential operators of the form iA(d/dx) + V acting in L2(R)n = Σ ⊕ L2(R)n, where A is a real diagonal constant matrix and V an Hermitian matrix valued function on R which satisfies some conditions to be stated in the sequel.