Epsilon Cardigan

We all know from school that letters are used to replace “unknown” numbers in Mathematics, but there are actually many conventions about which letters should be used for what purpose. We often use x and y for variables in equations, f for a function, c for a constant term. We use many Greek letters too. Gamma (γ) often denotes a curve, phi (φ) is often used for functions too. The Greek letter epsilon (ε) is almost always reserved for a very, very small unknown number. While it might be tiny it often forms the crux of proofs, especially in the branch of Maths called Analysis. This shrug might be pretty tiny too, but could end up being just as crucial to make a special dress look perfect!