Abstract Algebra I
M466, Fall 2010
Lecture: MWF 10:00-10:50, Engineering E205 (code 63370).
Detailed information on homework
Abstract algebra is a fundamental subject in mathematics. Its theory was developed in the 1800s when people realized that many different types of problems could be solved in the same way using underlying algebraic structures. It has applications in many fields such as cryptography and chemistry. In this course, we will study group theory and ring theory.
At its heart, algebra is about symmetries, of geometric objects or of roots of equations. The history of algebra starts with the quadratic formula, first found on Babylonian clay tablets from 1600 BC. During the Renaissance, mathematicians competed to find the roots of cubic and quartic equations. Everyone was stymied by the difficulty of finding roots of quintic (degree five) equations. The first hint of a new approach came when Lagrange showed that the quintic could not be solved by finding functions that are unchanged under permutations of the roots. Finally in 1824, Abel showed that there is no formula for the roots of the typical quintic equation. In modern terms, this is because the alternating group A_5 is simple.
In the second semester, we will study the work of Galois, a French mathematician who lived from 1811-1832. Galois was a political and mathematical revolutionary. His academic career and police record consist of one disaster after another. He died in a dual with a friend over a romantic attachment. In his short tumultuous life, Galois created a new theory, in which polynomials are studied using field extensions and groups of automorphisms.
We will also study elliptic curves, which are curves having a cubic equation. What is special about cubic curves is that there is a group law on the points on its graph. Because of this group law, some points on the graph have special properties. This is an inspiring topic, since elliptic curves played a crucial role in the proof of Fermat's Last Theorem and are used ubiquitously in cryptography.
Prerequisite: M366 and M369 or equivalent experience.
Judson, Abstract Algebra: Theory and Applications.
2) Ash, Abstract Algebra: The Basic Graduate Year.
3) Wilkons, Abstract Algebra Lecture Notes.
4) Clark, Elementary Abstract Algebra.
The course grades will be computed as follows:
20% homework; 20% first midterm; 20% second midterm; 15% Project and presentation; 25% Final.
Borderline grades will be decided on the basis of class participation.
Homework: Due every Wednesday. Homework is the most important part of this class. Doing homework problems is crucial for doing well in this class. The process of doing homework will help you solve unfamiliar problems on the tests. The homework problems will help you develop skills in algebraic computation and logical reasoning. The grader will only grade homework which is neat, legible, and stapled. I encourage you to brainstorm the problems in groups and write up your solutions independently.
Project: There are many amazing topics and applications of abstract algebra which we will not have time to cover fully. Each person will write a final project and give a presentation on one of these topics. This gives everyone a chance to learn one topic fully and to develop skill at presenting information. In addition, we'll see a snapshot of some fantastic topics.
There will be two midterms in class on Monday 10/4 and Wednesday 11/17.
The project is due Monday 12/3. The presentations will be in class between 12/6 and 12/10.
The final exam is Monday 12/13, 1:30-3:30.
There are no makeups for missed exams, regardless of the reason for absence. You must take the final examination at this time scheduled by the university; no final exams will be given earlier. Examinations will not be rescheduled because of travel arrangements. It is your responsibility to schedule travel appropriately.
Help: Help is always available if you have trouble with homework or lecture material. If your classmates can't answer your question, come ask me! Office hours are TBA in Weber 118.