Course meets: Monday, Wednesday, Friday 12; 3866 East Hall
Office Hours: 2844 East Hall, Wednesday 912, Thursday 14. 

Escher's "Circle Limit IV", whose symmetry group is the Coxeter group (3,4,4)  Euclid constructs the icosahedron, with symmetry group H_{3}. Book 13, Proposition 18 of the Elements, image courtesy of the Clay Mathematics Institute. 
Problem Set 1, due Friday September
15. Problem Set 2, due Monday September 25 (later date due to Rosh Hoshanah). Problem Set 3, due Friday September 29. Problem Set 4, due Friday October 6. Problem Set 5, due Friday October 13. No problem set for October 20, enjoy Fall break. 

A nondiagonalizable represenation of Ã_{2} 