Suppose you have a data matrix comprised of several stock options over a set period of time. How do you choose the optimal collection of stocks such that you maximize your returns for a given level of risk? What Markowitz found was an elegant equation.
What we realized rather quickly is there does not exist a closed form solution to this problem. Instead we use the tried and tested linear approximation. By transforming this problem into Matrix multiplication, we are able to quickly and (with desired accuracy) approximate the optimal solution, using only linear algebra.
A PocketMod is an 8-page booklet made from a single side of paper. This means you can recycle papers that's only been written/printed on one side. See PocketMod.com or this video for instructions to fold the PocketMod.
You can use it to create little books, brochures, handouts, daily planners, or just as a quick notepad or doodling sketchpad.