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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.

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    $\begingroup$ Why is $\pi$ sad? ‘Cos $\pi$ is negative. $\endgroup$ – Mindlack Nov 5 '19 at 23:41
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    $\begingroup$ What do you get when you cross a mosquito with a mountain climber? Nothing, you can't cross a vector with a scalar. $\endgroup$ – Don Thousand Nov 5 '19 at 23:43
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    $\begingroup$ 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!" $\endgroup$ – Shiranai Nov 5 '19 at 23:45
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    $\begingroup$ An extremely elaborate one but still the best I've seen so far link $\endgroup$ – Shiranai Nov 5 '19 at 23:49
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    $\begingroup$ This is a favorite. Perhaps too long, though. mathwithbaddrawings.com/2013/08/21/… $\endgroup$ – Doug M Nov 5 '19 at 23:51