Category: Free Online Math Materials

Gratis, and sometimes libre, books, software, etc.

Shadows from Higher Dimensions

By Andrew D. Hwang on July 9, 2025July 9, 2025

As a geometrically-minded complex geometer, I am continually vexed by our low-dimensional universe and how…

By Andrew D. Hwang on July 8, 2025July 9, 2025

Linear algebra underpins STEAM (science, technology, engineering, art, mathematics). At the same time, its ramifications…

By Andrew D. Hwang on July 7, 2025

The Hypercube allows us to explore shadows of a \(4\)-cube under rotations about coordinate planes…

By Andrew D. Hwang on July 6, 2025

Möbius Transformations helps visualize angle-preserving self-maps of the unit sphere in \(3\)-space. In Spring 2020,…

By Andrew D. Hwang on July 5, 2025

Torus Sketch is a simple, descriptively-named interactive program for drawing on a square torus. “Simple”…