His textbooks on linear algebra are considered the standard and are being used worldwide, and his legendary open course lectures on YouTube are extremely popular, racking up more than 20 million views in total. The title of his lecture for CSI is "Four Subspaces, Five Factorizations." He will be appearing via Zoom, on the screen in the 1P Lecture Hall. A short paper by Dr. Strang on the topic is available in advance upon request to mathematics@csi.cuny.edu.