Benjamin Peirce on e^(i pi)

Note on e^(i pi) = -1

Benjamin Peirce apparently liked this mathematical synonym
for the additive inverse of 1 so much that he introduced
three special symbols for e, i, pi —- ones that enable
e^(i pi) to be written in a single cursive ligature,
as shown here:

http://mathoverflow.net/questions/3134#5680

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