Number theory covering fundamentals and modern applications like modular arithmetic, quadratic reciprocity, Diophantine equations, and the circle method.
Andrei Caldararu was described as knowledgeable and dedicated, though he did not make the classes easy. Students reported needing to study hard to do well, found him difficult to read, and noted that grades were assigned only at the semester's end, making progress hard to track.
Recent recorded grades — Spring 2025: 4.00 GPA, 100.0% A/AB (n=10 letter grades); Fall 2025: 4.00 GPA, 100.0% A/AB (n=16 letter grades); Spring 2026: 4.00 GPA, 100.0% A/AB (n=12 letter grades).