Research article describing an approximate squaring of the circle using ruler and compass (exact squaring is impossible with just those two). File:Squaring the circle.

Easy way to understand the concept of dimensions and how the universe even started to exist

Manuscrit de Leibniz (1679) première page sur trois.

Fourier series square wave circles animation - Fourier series - Wikipedia, the free encyclopedia

Wavelength: lambda: the distance between any point on a wave and the corresponding point on the next crest (trough) of the wave; distance the wave travels during one cycle; expressed in meters, nanometers, micrometers, picometers m) or angstroms

History of mathematician Srinivasa Ramanujan’s lost notebooks and an exploration of solutions to those equations using Mathematica.