Acquired Introduction to Hilbert Space by Sterling K. Berberian (Oxford University Press, 1961)
This textbook has evolved from a set of lecture notes which I prepared for a semester course in Hilbert space. I have in mind first- or second-year graduate students in Mathematics and related fields such as Physics.
My textbook for Dr. Miller’s class Introduction to Hilbert Spaces: An Adventure In Infinite Dimensions has arrived.

🔖 Linear Operator Theory in Engineering and Science

Bookmarked Linear Operator Theory in Engineering and Science (Springer, 2nd printing 2000 edition (October 4, 2013))
A unique introduction to the theory of linear operators on Hilbert space. The author presents the basic facts of functional analysis in a form suitable for engineers, scientists, and applied mathematicians. Although the Definition-Theorem-Proof format of mathematics is used, careful attention is given to motivation of the material covered and many illustrative examples are presented.