# What is a good math joke? [closed]

Do you guys know any good math jokes? Thanks 3000. I would like to know a couple math jokes to use on my math teacher.

• Why is $\pi$ sad? ‘Cos $\pi$ is negative. Nov 5, 2019 at 23:41
• What do you get when you cross a mosquito with a mountain climber? Nothing, you can't cross a vector with a scalar. Nov 5, 2019 at 23:43
• From Munkres topology: "How is a set different from a door? A door must be either open or closed, and cannot be both, while a set can be open, or closed, or both, or neither!" Nov 5, 2019 at 23:45
• An extremely elaborate one but still the best I've seen so far link Nov 5, 2019 at 23:49
• This is a favorite. Perhaps too long, though. mathwithbaddrawings.com/2013/08/21/… Nov 5, 2019 at 23:51