Abstract
This work deals with decay bounds for Green matrices and generalized eigenvectors of block Jacobi matrices when the real part of the spectral parameter lies in an infinite gap of the operator’s essential spectrum. We consider the cases of commutative and noncommutative matrix entries separately. An example of a block Jacobi operator with noncommutative entries and nonnegative essential spectrum is given to illustrate the results.
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Acknowledgements
JJ and SN have been supported by the National Science Centre—Poland, Grant No. 2013/09/B/ST1/04319. SN was also supported by Grant RFBR 16-01-00443-a. LOS has been supported by UNAM-DGAPA-PAPIIT IN110818 and SEP-CONACYT CB-2015 254062. The authors thank the anonymous referee whose pertinent comments led to an improved presentation of this work.
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Janas, J., Naboko, S. & Silva, L.O. Green Matrix Estimates of Block Jacobi Matrices I: Unbounded Gap in the Essential Spectrum. Integr. Equ. Oper. Theory 90, 49 (2018). https://doi.org/10.1007/s00020-018-2476-0
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DOI: https://doi.org/10.1007/s00020-018-2476-0