Composition operators on the polydisc induced by smooth symbols

Hyungwoon Koo, Michael Stessin, Kehe Zhu

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


We study composition operators CΦ on the Hardy spaces Hp and weighted Bergman spaces Aαp of the polydisc Dn in Cn. When Φ is of class C2 on over(Dn, -), we show that CΦ is bounded on Hp or Aαp if and only if the Jacobian of Φ does not vanish on those points ζ on the distinguished boundary Tn such that Φ (ζ) ∈ Tn. Moreover, we show that if ε > 0 and if CΦ : Aαp → Aα + frac(1, 2 n) - εp, then CΦ is bounded on Aαp.

Original languageEnglish
Pages (from-to)2911-2925
Number of pages15
JournalJournal of Functional Analysis
Issue number11
Publication statusPublished - 2008 Jun 1

Bibliographical note

Funding Information:
✩ H. Koo is partially supported by SBS and K. Zhu is partially supported by NSF. * Corresponding author. E-mail addresses: (H. Koo), (M. Stessin), (K. Zhu).


  • Composition operator
  • Jacobian
  • Polydisc

ASJC Scopus subject areas

  • Analysis


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