Introduces barrier nonsubordinacy and proves it implies absolutely continuous spectrum for block Jacobi matrices, extending d=1 conditions to d greater than or equal to 1.
´Swiderski, Periodic perturbations of unbounded Jacobi matrices II: Fo rmulas for density , J
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Barrier nonsubordinacy and absolutely continuous spectrum of block Jacobi matrices
Introduces barrier nonsubordinacy and proves it implies absolutely continuous spectrum for block Jacobi matrices, extending d=1 conditions to d greater than or equal to 1.