Lesson 1 - Undefined Terms

Why do we need to learn proofs?

A proof is an argument, a justification, a reason that something is true. It’s
got to be a particular kind of reasoning – logical – to be called a proof.


In fact, you use “proofs” all the time. When you reason with yourself that it
will be cheaper to buy the larger cans of beans, you are proving something about
the respective prices.