functional analysis - Show that the exponentials $1, e^{2\pi ix}, \dots , e ^{2\pi ikx}, \dots$ form the basis for trigonometric polynomials. - Mathematics Stack Exchange
Gelfond's constant - Wikipedia
Basel problem - Wikipedia
Jacobi Theta Functions -- from Wolfram MathWorld
Euler's formula | Definition & Facts | Britannica
Solved E^j pi = cos pi + j sin pi = -1 + 0 = -1 e^j pi = 1 < | Chegg.com
Re: e^x - (e^x*1i)^-1i - (e^pi)*sin( x + [pi/2] ) ... - PTC Community