The first one says: "The average person is, mathematically, an idiot. People don't know algebra, can't figure out percents, can't read a simple graph, and don't even get me started on calculus..."
The second professor disagrees, "Surely you're exaggerating. Most people know all the math they need to know, or more."
Some time later, the first professor goes to the men's room. The other mathematician beckons to the waitress and says, "Next time you come to our table, I am going to ask you a question. No matter what I ask, I want you to answer by saying 'x-squared'. Please don't mess it up and there's an extra tip coming your way."
The waitress agrees. When the first mathematician returns, his companion says, "So lets put your theory to the test. I am going to ask some random person who comes by our table an elementary calculus question, and we'll see if they can solve it."
Soon the waitress comes by and he says, "Excuse me, Miss, can you bring me more tea, please -- and by the way -- can you tell me what the integral of 2x with respect to x is?"
The waitress replies, "Certainly sir, more tea it is. And it's x-squared."
The mathematician says, "See! What did I tell you?" His friend is dumbfounded.
The waitress, meanwhile, goes to bring tea, and, having turned her back on the two professors, mutters under her breath: "Plus a constant."
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