## MATH 420 / 421: Algebra I, II

General information and additional resources maintained by

This is a personal page that I maintain even during semesters in which I do not teach the course. Some of the following files are in postscript format (ps), which requires a postscript viewer. When using NETSCAPE on our departmental network, the viewer will come up automatically. If you need your own postscript viewer, you can obtain information from the Ghostview site.

#### Supplements to the textbook:

OnLine Study Guide (summaries of each section, with solved problems)
Overview / review of
• basic group theory (pdf), for 420
• factor groups and homomorphisms (pdf), for 421
• commutative rings (pdf), for 421
Some group multiplication tables (html) (text)
Preview of Galois theory (html) (ps)

#### History of Abstract Algebra:

Homepages of Abel | Emil Artin | Galois | Emmy Noether

Biographies (from St. Andrews University, Scotland)
History of Abstract Algebra, from St. Andrews University
Timeline for the use of symmetry in physics, chemistry, and mathematics
Timeline for associative algebras

#### Links to supplement the course:

Factor polynomials using Mathematica, from Vanderbilt University

Maple worksheets, developed by Mike May
Introduction to Logic, from Hofstra Univiversity
Essay on symmetry and group theory, from The Geometry Forum
Symmetry groups, from the Symmetry Web
Plane symmetry groups, from Clark University
Symmetry and Group Theory, from the University of California, Irvine
Rubik's cube
Lecture notes on Rubik's cube
Solving Cubic and Quartic Equations, from the University of Sydney
Solving the quintic and Quintic poster, from Wolfram Research

Abstract Algebra resources, from the University of Tennessee at Knoxville
Group theory resources (from Dave Rusin)
Algebraic systems (from Christer Blomqvist, Sweden)
Number Theory Web, maintained by Keith Matthews, at the University of Queensland
Online Books and Notes by E. Connell and L. Pomeroy

#### Links to applications:

Modular arithmetic pages, from Cal State, San Bernardino
Public Key Cryptography, from the AMS
Public Key Cryptography, from D. Wright at Oklahoma State
The Numeroscope, an interactive laboratory of numbers and cryptography
Number theory and public key cryptography, from Australia
Number theory and public key cryptography (2)
Digital Signatures, from S. Gao at Clemson University
Elliptic Curve Cryptosystems, from RSA Security
Cryptography links, from Cryptography Research, Inc.
Group theory and physics, from the Notices of the AMS, January, 1997
Group theory and crystallography, from Oak Ridge National Lab
Group theory in digital signal processing (see the Research Activities link)
Music and mod 12 arithmetic, by L. Solomon

#### Books on applications:

J.S.Lomont, Applications of Finite Groups, Dover Publications, Inc.
M.Hamermesh, Group Theory and its Application to Physical Problems, Dover Publications, Inc.
D.M.Bishop, Group Theory and Chemistry, Dover Publications, Inc.
George Perle, Serial Composition and Atonality: an Introduction to the Music of Schoenberg, Berg, and Webern. 1962; 6th edition, revised, 1991. University of California Press.

#### Previous semesters:

Final exams: 420 (pdf) | 420 (html) | 421
420 Syllabus: Spring 97 | Fall 95
421 Syllabus: Spring 96 | Summer 95

#### Graduate study in algebra:

At NIU and at the University of Illinois at Urbana-Champaign
Rankings of programs, by US News and World Report
Algebraic Structures, Math 520, at NIU

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