👉 In mathematics, a "leveller" is a function that maps one domain to another. It is an operator that takes two elements from different domains and produces a single element that belongs in both domains. This property allows for the definition of a "function between" or "function composition", where a function f can be defined as: f(x) = g(y) Where x and y are elements from different domains. For example, consider the following functions: 1. f(x) = 3
