Chemists are used to the operational definition of symmetry, which
crystallographers introduced long before the advent of quantum
mechanics. The ball-and-stick models of molecules naturally exhibit the
symmetrical properties of macroscopic objects. However, the practitioner
of quantum chemistry and molecular modeling is not concerned with balls
and sticks, but with subatomic particles: nuclei and electrons.
This textbook introduces the subtle metaphors which relate our
macroscopic understanding of symmetry to the molecular world. It
gradually explains how bodily rotations and reflections, which leave all
inter-particle distances unaltered, affect the study of molecular
phenomena that depend only on these internal distances. It helps readers
to acquire the skills to make use of the mathematical tools of group
theory for whatever chemical problems they are confronted with in the
course of their own research.