I’ve heard variants of this joke for a long time, and despite being vague, it’s still kind of funny. And also completely true.

A mathematician and his best friend, an engineer, attend a public lecture on geometry in thirteen-dimensional space.

“How did you like it?” the mathematician wants to know after the talk.

“My head’s spinning”, the engineer confesses. “How can you develop any intuition for thirteen-dimensional space?”“Well, it’s not even difficult. All I do is visualize the situation in arbitrary

N-dimensional space and then setN= 13.”(Volker Runde)

Of course, one wonders why the public lecture is on thirteen-dimensional space in the first place if a generalization to *N* dimensions already exists. Details!

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