Look at your Quiz #3 which was returned and make sure you understand my comments. If your proof wasn’t correct, write a correct proof and check it with me at office hours or after class.

Finish the two worksheets from class today (if you missed them, check the Lectures page).

Prove or disprove: There exists a real number x such that x^2 > 0 but x^3 < 0.

Prove or disprove: All pairs of integers a and b have gcd(a,b) > 1.

Spend time as needed (active reading + exercises) with Hammack, Sections 2.6 and 2.7. This is the material of Badges Logic III and Logic V which will now be on badges quizzes.