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# Group Theory

Group theory is the study of symmetry. Objects in nature (physics, chemistry, music, etc.) as well as objects in mathematics itself have beautiful symmetries, and group theory is the algebraic language we use to unlock that beauty. Group theory is the gateway to abstract algebra and tells us (among many other things) that you can't trisect an angle with a straightedge and compass, that there are finitely many perfectly symmetric tiling patterns, and that there is no closed formula for solving a quintic polynomial. In this class we will get a glimpse of the mathematics underlying these famous questions. This course will focus concretely on building groups from other groups, exploring groups as symmetries of geometric objects, and using the tools of group theory to construct fields. The overarching goal of the course is to learn how modern mathematicians understand a topic as general and seemingly fuzzy as “symmetry”.

14 weeks

SYLLABUS
14 weeks

## Schedule

 Sunday Jun 16 - Sep 22 7:30 - 9:30PM ET Jun 16 - Sep 227:30 - 9:30 PM Eastern6:30 - 8:30 PM Central5:30 - 7:30 PM Mountain4:30 - 6:30 PM PacificClick here to see more time zones Jeffery Yu \$545 (~\$39/lesson) \$545 (~\$39/lesson) CLOSED

### AoPS Holidays

There are no classes August 30 ‐ September 2, October 31, November 25 ‐ December 1, and December 21, 2024 ‐ January 3, 2025.

### Who Should Take?

This class is aimed primarily at students who have mastered the standard high school curriculum and do not have access to a strong post-secondary curriculum. We assume fluency with modular arithmetic, the complex numbers, and basic combinatorics, and also a good background in forming mathematical arguments and writing proofs. The class will be on the level of the most difficult Art of Problem Solving courses. We will not assume any calculus, but we will rely on precalculus, number theory, and counting extensively.

### Lessons

 1 Symmetry 2 Examples of Groups 3 Subgroups 4 Abelian Groups 5 Group Actions 6 Orbits and Stabilizers 7 Burnside and Beyond 8 Quotients 9 Functions from Groups to Groups 10 Geometry and Group Theory 11 Fields 12 Field Extensions 13 Constructions and Automorphisms 14 Groups and Fields

I loved the course. I learned a lot about group theory that I've had a hard time picking up informally in my work. Just seeing that group theory doesn't have to involve matrix representations (the way it's often treated in physics) was enlightening. All-in-all it was a wonderful course that I completely enjoyed!