Polynomial as a new variable — A Banach algebra with a functional calculus

Research output: Contribution to journalArticleScientificpeer-review


Research units


Given any square matrix or a bounded operator A in a Hilbert space such that p(A) is normal (or similar to normal), we construct a Banach algebra, depending on the polynomial p, for which a simple functional calculus holds. When the polynomial is of degree d, then the algebra deals with continuous ℂd-valued functions, defined on the spectrum of p(A). In particular, the calculus provides a natural approach to deal with nontrivial Jordan blocks and one does not need differentiability at such eigenvalues.


Original languageEnglish
Pages (from-to)567-592
Number of pages26
Issue number3
Publication statusPublished - 1 Sep 2016
MoE publication typeA1 Journal article-refereed

    Research areas

  • Functional calculus, Multicentric calculus, Polynomially normal, Removing Jordan blocks, Spectral mapping

ID: 9362561