For Monday:

- There will be a Proofs Quiz, using the method of contrapositive proof.
- Complete the contrapositive setup worksheet and compare to solutions. Here: Proof by Contrapositive Setup Sheet and solutions.
- Read Hammack’s Chapter 5.
- Do the two contrapositive proofs I assigned in class:
- If xy is greater than 100, then at least one of x or y is greater than 10.
- If 3 divides n^2 then 3 divides n.

- Do Exercises from Chapter 5.

## Professor Katherine Stange, Spring 2018