ABSTRACT ALGEBRA: Review of Groups and Galois Theory
*ABSTRACT ALGEBRA:*

# REVIEW OF GROUPS AND GALOIS THEORY

### John A. Beachy

Department of Mathematical Sciences

Northern Illinois University

This review material is intended for students
who are studying Chapters 7 and 8 of the **Third Edition** of our textbook
*Abstract Algebra*
(co-authored with William D. Blair).
These chapters correspond roughly to the first semester of the current
graduate algebra course at NIU.
I have included summaries of most of these sections,
together with some general comments.
The review problems are intended to have relatively short answers,
and to be more typical of exam questions
than of standard textbook exercises.
Many of them have been used on our comprehensive exam in algebra.

By assuming that this is a review,
I have been able make some minor changes
in the order of presentation.
For example, the first section covers various examples of groups.
In presenting these examples, I have introduced
some concepts that are not studied until later in the text.
I think it is helpful to have the examples collected in one spot,
so that you can refer to them as you review.

From the Preface to the Review:
"*Abstract Algebra* begins at the undergraduate level,
but Chapters 7 - 9
are written at a level that we consider appropriate
for a student who has spent the better part
of a year learning abstract algebra.
Although it is more sharply focused
than the standard graduate level textbooks,
and does not go into as much generality,
I hope that its features make it a good place to learn
about groups and Galois theory,
or to review the basic definitions and theorems."

The file is in pdf format, suitable for viewing with
Adobe Acrobat Reader.
It can also be downloaded and printed, with only minor restrictions
(see page ii of the review).

Please send me email if you find typos or mathematical mistakes.

Posted 1/11/2007

* Review of Groups and Galois Theory *

55 pages, pdf format, ~400k