differential equations

Differential equations, studying the unsolvable | DE1 (A Tourist's Guide to Differential Equations) from 3Blue1Brown

But what is a partial differential equation? | DE2 from 3Blue1Brown

Solving the heat equation | DE3 from 3Blue1Brown

But what is a Fourier series? From heat flow to circle drawings | DE4 from 3Blue1Brown

Understanding e to the i pi in 3.14 minutes | DE5 from 3Blue1Brown

ellipse - Why is there no equation for the perimeter of an ellipse?

integer sequences encyclopedia

prime numbers make spirals in polar coordinates