Proof that a cat has 9 tails:
No cat has 8 tails. A cat has 1 more tail than no cat. Therefore, a cat has 8 + 1 = 9 tails. QED
Cathy Guisewite
Donna A. Lewis
Proof that a cat has 9 tails:
No cat has 8 tails. A cat has 1 more tail than no cat. Therefore, a cat has 8 + 1 = 9 tails. QED