The average number of representations of a natural number as a sum of two squares (i.e., $n=x^2+y^2$) is $\pi.$. (Image courtesy of Rose Wong.)
18.104 is an undergraduate level seminar for mathematics majors. Students present and discuss subject matter taken from current journals or books. Instruction and practice in written and oral communication is provided. The topics vary from year to year. The topic for this term is Applications to Number Theory.