The Blancmange curve, \(B(x)\), named after a pudding of a similar shape, is continuous but not differentiable anywhere.

# Category: math

## A very basic introduction to splines

A spline interpolates dataâ€”that is, fills the gaps between known points. Between two adjacent points a spline is an ordinary polynomial. The simplest spline is a connecting line (a linear spline), but here we consider quadratics.