math

From http://limerickdb.com/?top150 :

If A equals B (so I say),
And we multiply both sides by A,
Then we'll see that A squared,
When with AB compared,
Are the same. Remove B squared. Okay?

Both sides we will factorize. See?
Now each side contains A minus B.
We'll divide through by A
Minus B, and ole!
A plus B equals B. Oh whoopee!

But since I said A equals B,
B plus B equals B, you'll agree?
So if B equals one,
Then this sum I have done,
Proves that two equals one. Q.E.D.