Euler's identity: Math geeks extol its beauty ... You can take this farther, too. If you write that function above in a more general but still simple form as f(x) = e (zx), where z = (a + bi ...

William Demchick The purple curve is the graph of the natural log function. The Blue bars are the values of the harmonic series. The difference between them is Euler\'s constant. Despite its ...