A lecture hall in front of a couple hundred students of "Topics in Mathematics for Engineers" (i.e., grab-bag of ODEs, PDEs, and linear algebra). I hadn't prepa

A lecture hall in front of a couple hundred students of "Topics in Mathematics for Engineers" (i.e., grab-bag of ODEs, PDEs, and linear algebra). I hadn't prepared a lecture for the day, so instead I did a live implementation of reduction to reduced-row-echelon form, in C.