This book provides an in-depth and rigorous study of the Wigner
transform and its variants. They are presented first within a context of
a general mathematical framework, and then through applications to
quantum mechanics. The Wigner transform was introduced by Eugene Wigner
in 1932 as a probability quasi-distribution which allows expression of
quantum mechanical expectation values in the same form as the averages
of classical statistical mechanics. It is also used in signal processing
as a transform in time-frequency analysis, closely related to the
windowed Gabor transform.Written for advanced-level students and
professors in mathematics and mathematical physics, it is designed as a
complete textbook course providing analysis on the most important
research on the subject to date. Due to the advanced nature of the
content, it is also suitable for research mathematicians, engineers and
chemists active in the field.