Browsing by Subject "Idempotent"

Now showing items 1-3 of 3

    • Pseudospectra of elements of reduced Banach algebras (Pre-published version) 

      Kulkarni, S H; Krishnan, Arundhathi (Springer, 2017)
      Let A be a Banach algebra with identity 1 and p ∈ A be a non-trivial idempotent. Then q = 1−p is also an idempotent. The subalgebras pAp and qAq are Banach algebras, called reduced Banach algebras, with identities p and q ...

    • Pseudospectra of elements of reduced Banach algebras II (Pre-published version) 

      Kulkarni, S H; Krishnan, Arundhathi (Faculty of Sciences and Mathematics, University of Nis, Serbia, 2018-06)
      Let A be a Banach algebra with identity 1 and p ∈ A be a non-trivial idempotent. Then q = 1 − p is also an idempotent. The subalgebras pAp and qAq are Banach algebras, called reduced Banach algebras, with identities p and ...

    • Pseudospectrum of an element of a Banach algebra (Pre-published version) 

      Kulkarni, S H; Krishnan, Arundhathi (Element Publishing House, 2017-03)
      The ε -pseudospectrum Λε (a) of an element a of an arbitrary Banach algebra A is studied. Its relationships with the spectrum and numerical range of a are given. Characterizations of scalar, Hermitian and Hermitian idempotent ...