My personal favorite relation between π and e 
Is there any other mathematician whose work is instantly recognizable?pic.twitter.com/WMliDN17Vs
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Thanks to Euler: unit circle r=1: z=x+i y=cos(a)+i sin(a) dz/da=-sin(a)+i cos(a)= iz Therefore: dz/da=iz solving z=e^(ia)=cos(a)+i sin(a) Choosing: a=0.5 Pi: e^(0.5Pi)=i (since cos(0.5Pi)=0, sin(0.5Pi)=1) Raising to the power of "i": (e^(0.5Pi))^i=i^i=e^(-0.5Pi) q.e.d.#
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I already did it > 25 years ago ;-)
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But you rather typeset in Unicode? Lol
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