When we began to consider the scope of this book, we envisaged a
catalogue supplying at least one abstract definition for any finitely-
generated group that the reader might propose. But we soon realized that
more or less arbitrary restrictions are necessary, because interesting
groups are so numerous. For permutation groups of degree 8 or less
(i.e.' .subgroups of es), the reader cannot do better than consult the
tables of JosEPHINE BuRNS (1915), while keeping an eye open for
misprints. Our own tables (on pages 134-142) deal with groups of low
order, finite and infinite groups of congruent transformations,
symmetric and alternating groups, linear fractional groups, and groups
generated by reflections in real Euclidean space of any number of
dimensions. The best substitute for a more extensive catalogue is the
description (in Chapter 2) of a method whereby the reader can easily
work out his own abstract definition for almost any given finite group.
This method is sufficiently mechanical for the use of an electronic
computer.