Two mathematicians are studying a convergent series.
"Cool, the series converges even when all the terms are made positive!"
"Are you sure?"
"Absolutely!"

What's yellow and equivalent to the axiom of choice?
Zorn's lemon.

What's purple and commutes?
An abelian grape.

What is normed, complete, and yellow?
A Bananach space.

Do you know any catchy anagram of Banach-Tarski?
Banach-Tarski Banach-Tarski

Three statisticians go hunting. When they see a rabbit, the first one shoots, missing it on the left. The second one shoots and misses it on the right.
The third one shouts: "We've hit it!"

What do you get when you cross an elephant and a tiger?
Another animal perpendicular to both the elephant and the tiger whose magnitude depends on the magnitudes and angle between the given animals.

What do you get when you cross an elephant and a mountain climber?
You can't! A mountain climber is a scalar.

What do you get when you cross an elephant and a rhino?
Elefino!

"What's your favorite part of math?"
"Knot theory."
"Yeah, me neither."

A mathematician, a biologist and a physicist are sitting in a street cafe watching people going in and coming out of the house on the other side of the street. First they see two people going into the house. Time passes. After a while they notice three persons coming out of the house. The physicist says, "The measurement wasn't accurate." The biologist says, "They must have reproduced." The mathematician says, "If one more person enters the house then it will be empty."

There are only 10 types of people in the world - those who understand trinary, those who don't, and those who mistake it for binary.

A professor is writing the proof of a theorem on the board for his students. Part way through, he skips proving a case, telling his students that "it's obvious." A student raises his hand and questions the professor on this point. So the professor stops the lecture and silently stares off into space. Minute after minute passes. Then, all of a sudden, and with a flash of inspiration on his face, he tells the student, "ah, yes, it is obvious," and continues the lecture.

Why did the chicken cross the Mobius strip?

Up