Same here, and also agree with the "prime" notation, i.e., y'! One of my instructors had joked that the dot/prime notations saved printing costs in the days whe

Same here, and also agree with the "prime" notation, i.e., y'! One of my instructors had joked that the dot/prime notations saved printing costs in the days when printing was expensive - not sure if there is any truth to that.