Lecture 23 (17 April)

We did exercises on

• Building bijections from a set A to N to show that A is countably infinite.
• Showing that a countable union of countable sets is countable.

Announcements

• Be sure to check your final exam schedule for conflicts. Conflicts MUST be reported to instructors by the last day of classes.
• The third honors homework (due Thursday) will be the last honors homework.