(Originally written for my Intro to Homological Algebra Summer Seminar Group at SJC) One of the first things you learn in Algebra, is how to manipulate equations. Given the equation: $latex 2x + 3 = 4,$ we quickly learned how to subtract 3 from both sides of the equation. In this post, I would like to go … Continue reading Why can we add to both sides of an equation?
