Abstract
Oscillation theory for one-dimensional Dirac operators with sep- arated boundary conditions is investigated. Our main theorem reads: If 0;1 2 R and if u;v solve the Dirac equation Hu = 0u, Hv = 1v (in the weak sense) and respectively satisfy the boundary condition on the left/right, then the dimension of the spectral projection P( 0; 1)(H) equals the number of zeros of the Wronskian of u and v. As an application we establish niteness of the number of eigenvalues in essential spectral gaps of perturbed periodic Dirac operators.
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