In class, we started two worksheets, one on setting up proofs by contradiction (about formal writing of such proofs), and contradiction puzzles (fun proofs that require a creative idea). At home, please complete both of these worksheets and bring them to class on Monday. If you aren’t sure of the secret key to one of these, discuss with your roommates, other math majors, or peers in the class to brainstorm ideas.

With remaining time, study for the proofs quiz, which will be a proof by contradiction on Monday. Hammack has exercises and examples.