We define Euler's totient function and give some basic examples. http://www.michael-penn.net
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the why of the determinant
a very special knights tour
the strangeness of transfinite arithmetic
generalizing the Gaussian Integral
a great proof of my favorite identity
on the prime counting function
The exact solution to any quintic equation
Have you seen this definition of Euler's number??
trigonometry like you have never seen it!
on the "product" of all natural numbers.
You can divide by zero.
Math's most viral equation