whatilearned
Read more: https://en.wikipedia.org/wiki/Leonhard_Euler
TIL about Leonhard Euler (1707-1783) who not only popularised the use of lower case Pi to denote the ratio of a circle’s circumference to it’s diameter, but was also the first to use “i” to denote the square root of -1. The constant “e”, the base number in a natural logarithm is the Euler Number
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There’s a reason this guy has [a separate page](https://en.wikipedia.org/wiki/List_of_things_named_after_Leonhard_Euler) for all the things named after him.
you should visit r/mathmemes
“Hey man, what’s the ratio of a circle’s circumference to its diameter?”
“Uh, π.”
“How about the square root of -1, what’s that?”
“Hm…i.”
“Cool, hey I’m looking to solve for the base of the natural logarithm. Can you help?”
“Sure, it’s e.”
“Do you know any fucking math?”
And he did all of this in a CAVE, with a BOX OF **SCRAPS!**