Math Quote Of The Day.

Having discussed the axiom of choice earlier today I wanted to post a quote by the mathematician Jerry Bona.

"The Axiom of Choice is obviously true, the well-ordering principle obviously false, and who can tell about Zorn's lemma?"

I guarantee you mathematicians will find this hilarious but for those of you left in the dark, the Wikipedia goes on to say:  "This is a joke: although the three are all mathematically equivalent, many mathematicians find the axiom of choice to be intuitive, the well-ordering principle to be counterintuitive, and Zorn's lemma to be too complex for any intuition."