This directory contains lecture notes for CSC 2/454. At the beginning of the semester it will contain the versions used the last time I taught the course. I will update these as the semester progresses. The top line of each file will tell you whether it is current or not. In the past, they have served as a very rough script for at-the-chalkboard lectures. For Fall 2020, they are serving as slightly more organized scripts for pre-recorded lectures. If you read ahead, take what you see with a grain of salt: you'll be seeing the rougher, older versions, which have omissions, digressions, anachronisms, and notes to myself. The newer versions are far from perfect, but they've been better vetted.