ISBN-13: 9780367337100 / Angielski / Twarda / 2019 / 160 str.
ISBN-13: 9780367337100 / Angielski / Twarda / 2019 / 160 str.
The main aim of this book is to present several results related to functions of unitary operators on complex Hilbert spaces obtained, by the author in a sequence of recent research papers.