Intro to Proofs – Countability – Rationals

This is a video for a university course about Introduction to Mathematical Proofs.

Topics covered:

1. Proof that the rationals are countable. (spiral argument)
2. Proof that the product of countable sets is countable.

This was originally made for the University of Toronto Mississauga in Summer 2020, for MAT102.

All material for the course can be found at:

Introduction to Proofs