Linear Operators in Hilbert Spaces by Weidmann, Hardcover, Springer Mathematics

Theory Of Linear Operators In Hilbert Space Vol. 1 - 1966 Akhiezer & Glazman HC

The Analysis Of Linear Partial Differential Operators IV by Hormander Springer

Perturbation Theory for Linear Operators by Tosio Kato (Paperback, 1995)

Unbounded Linear Operators Theory & Applications ~ Seymour Goldberg ~ 1966 HC

Naval Ordinance Lab Copy! Linear Differential Operators by Lanczos HC 1st

Linear Differential Operators - Paperback By Lanczos, Cornelius

Linear Differential Operators (Paperback or Softback)