This book is a continuation of Volume I of the same title [Grund-
lehren der mathematischen Wissenschaften, Band 115 ]. We constantly
1 1. The textbook Real and cite definitions and results from Volume
abstract analysis by E. HEWITT and K. R. STROMBERG [Berlin - Gottin-
gen -Heidelberg: Springer-Verlag 1965], which appeared between the
publication of the two volumes of this work, contains many standard
facts from analysis. We use this book as a convenient reference for such
facts, and denote it in the text by RAAA. Most readers will have only
occasional need actually to read in RAAA. Our goal in this volume is to
present the most important parts of harmonic analysis on compact groups
and on locally compact Abelian groups. We deal with general locally
compact groups only where they are the natural setting for what we are
considering, or where one or another group provides a useful
counterexample. Readers who are interested only in compact groups may
read as follows: § 27, Appendix D, §§ 28-30 [omitting subheads
(30.6)-(30.60)ifdesired], (31.22)-(31.25), §§ 32, 34-38, 44. Readers
who are interested only in locally compact Abelian groups may read as
follows: §§ 31-33, 39-42, selected Mis- cellaneous Theorems and Examples
in §§34-38. For all readers, § 43 is interesting but optional. Obviously
we have not been able to cover all of harmonic analysis.