In Good Will Hunting (1997), what subject does Will Hunting master at MIT?

In Good Will Hunting (1997), Will Hunting is a mathematical genius who solves difficult problems at MIT.

Will works as a janitor at the Massachusetts Institute of Technology but secretly possesses extraordinary mathematical ability. Professor Gerald Lambeau notices his talent after Will solves a challenging problem written on a hallway board.

The film follows Will as he confronts his past and considers whether to use his abilities. A court arrangement requires him to study mathematics and attend therapy, leading to his important relationship with therapist Sean Maguire, played by Robin Williams.

Matt Damon and Ben Affleck wrote the screenplay and also appear in the film. Damon plays Will, while Affleck plays his best friend Chuckie. Robin Williams won the Academy Award for Best Supporting Actor for his performance.