🔍 Introduction to Proof

6 lessons — learn to think like a mathematician!

Lessons

What Is a Proof?

2 pages · examples vs. proof, true/false claims, always vs. sometimes

Counterexamples

2 pages · disproving false claims with a single example

Even & Odd Number Proofs

2 pages · visual dot-pair proofs for even/odd addition rules

2 pages · staircase sums, L-shaped odd numbers, visual reasoning

Proof by Trying All Cases

2 pages · exhaustive checking when there are only a few possibilities

If-Then Reasoning

2 pages · building logical chains, direct proof, divisibility rules

🖨️ Tip: Work through the lessons in order. Use Ctrl+P (or ⌘P) to print.