On the kernel and cokernel of some toeplitz operators

Torsten Ehrhardt, Ilya M. Spitkovsky

Research output: Chapter in Book/Report/Conference proceedingChapter


We show that the kernel and/or cokernel of a block Toeplitz operator T (G) are trivial if its matrix-valued symbol G satisfies the condition G(t−1)G(t)*=ING(t−1)G(t)*=IN. As a consequence, the Wiener–Hopf factorization of G (provided it exists) must be canonical. Our setting is that of weighted Hardy spaces on the unit circle. We extend our result to Toeplitz operators on weighted Hardy spaces on the real line, and also Toeplitz operators on weighted sequence spaces.

Original languageEnglish (US)
Title of host publicationOperator Theory
Subtitle of host publicationAdvances and Applications
PublisherSpringer International Publishing
Number of pages18
StatePublished - 2013

Publication series

NameOperator Theory: Advances and Applications
ISSN (Print)0255-0156
ISSN (Electronic)2296-4878


  • Discrete convolution operators
  • Partial indices
  • Toeplitz operators
  • Wiener–Hopf factorization

ASJC Scopus subject areas

  • Analysis


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