On a generalization of Smirnov's theorem with some applications

Lasha Ephremidze, Ilya Spitkovsky

Research output: Contribution to journalArticlepeer-review


We present a certain generalization of Smirnov's theorem on functions from the Hardy spaces H p Hp . We provide some applications of the proposed generalization. Namely, we give an equivalent characterization of outer analytic rectangular matrix functions, and give a simple proof of the uniqueness of spectral factorization of rank deficient matrices.

Original languageEnglish (US)
Pages (from-to)217-220
Number of pages4
JournalGeorgian Mathematical Journal
Issue number2
StatePublished - Jun 1 2018


  • Smirnov's theorem
  • matrix spectral factorization
  • outer matrix functions

ASJC Scopus subject areas

  • General Mathematics


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