Proof Quiz will be a proof that a function is/is not injective/surjective. Read Hammack Section 12.2. Examples 12.4 and 12.5 are ideal models, as are exercises 2-10 (where “verify” means “prove or disprove” (disprove means prove the negation).

Reminder that individual homework is due. The assignment is under Resources (above) under Groupwork. (But you can do it individually.) Hand in on canvas.

You can still earn badges in office hour Wed/Thur, as explained previously.

In class, we will continue talking about functions and cardinalities.