I'm sure "e" stands for "Euler" - but he very cleverly introduced it as the fifth variable in a paper, after other variables called a, b, c, and d.
Euler was born exactly 312 years ago. All the following symbols and notations were introduced by Euler.pic.twitter.com/kI2ky4U3h5
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Always thought it was historically interesting that the integral sign is older than the summation sigma...
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William Jones introduced π as the ratio of a circle's circumference to its diameter in his 1706 book Synopsis palmariorum matheseos http://bit.ly/2C2OOww , a year before Euler‘s birth (he popularised it in his Introductio in analysin infinitorum in 1748 http://bit.ly/2NFnokK ).pic.twitter.com/Jy2afwxYmV
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Math history should be an interesting topic to teach
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