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Cross commutators on backward shift invariant subspaces over the bidisk II

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In the previous paper, we gave a characterization of backward shift invariant subspaces of the Hardy space over the bidisk on which [Szn; S w] = 0 for a positive integer n  2. In this case, it holds that Szn = cI for some c 2 C. In this paper, it is proved that if [Sφ; S w] = 0and φ 2 H1(􀀀z), then Sφ = cI for some c 2 C.

Abstract

In the previous paper, we gave a characterization of backward shift invariant subspaces of the Hardy space over the bidisk on which [Szn; S w] = 0 for a positive integer n  2. In this case, it holds that Szn = cI for some c 2 C. In this paper, it is proved that if [Sφ; S w] = 0and φ 2 H1(􀀀z), then Sφ = cI for some c 2 C.

참고문헌 (11)

  1. H. Bercovici, "Operator Theory and Arithmetic in H1, Mathematical Surveys and Mono- graphs" (1988), American Mathematical Society
  2. A. Beurling, "On two problems concerning linear transformations in Hilbert space", Acta Math, 81, pp.239~255 (1948)
  3. X. Chen, "Analytic Hilbert Modules", pp.2003, Chapman & Hall
  4. K. J. Izuchi, "Commutativity in two variable Jordan blocks on the Hardy space"
  5. K. J. Izuchi, "Cross commutators on backward shift invariant subspaces over the bidisk", Acta Sci. Math. (Szeged), 72(1-2), pp.251~270 (2006)
  6. K. J. Izuchi, "Backward shift invariant subspaces in the bidisc. II", J. Operator Theory, 51(2), pp.361~376 (2004)
  7. K. J. Izuchi, "Backward shift invariant subspaces in the bidisc. III", Acta Sci. Math. (Szeged), 70(3-4), pp.727~749 (2004)
  8. V. Mandrekar, "The validity of Beurling theorems in polydiscs", Proc. Amer. Math. Soc, 103(1), pp.145~148 (1988)
  9. N. Nikol'skii, "Treatise on the Shift Operator" (1986), Springer-Verlag
  10. W. Rudin, "Function Theory in Polydiscs" (1969), Benjamin
  11. R. Schneider, "Isometries of Hp(Un)", Canad. J. Math, 25, pp.92~95 (1973)

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