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.
Gilbert, On subordinacy and analysis of the spectrum of Schr ¨odinger operators with two singular endpoints , Proc
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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.