👉 In mathematics, "couped" is a term used to describe a set of two or more points in a plane. It is often used in geometry and linear algebra to denote a subset that lies between two other sets. The terms "closed" and "open" are often used to refer to the boundaries of these subsets. For example, if we have a plane with two lines passing through it, and we want to define the set of points on one line as being in the same plane as