A list of puns related to "Notations"
but I don't really mind as the 24th of July is ages away
http://imgur.com/gallery/vNoFX
St. Peter: Your number's up Euler, and Isaac Newton says you have to count all the spheres in the universe before you can enter heaven. What say ye?
Euler: Sigma balls, Dick.
Sigma is used to notate summation.
Summation is the process of adding things together.
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