👉 A concept in mathematics, specifically in algebra, where a function is defined by a formula involving one or more variables, but its graph does not have a simple closed form expression. This can be seen as an instance of a function that has a "weakly" defined behavior. In simpler terms, a weakly-defined function is one where the domain and range are both infinite sets. For example, in the complex plane, the real part and imaginary part of any complex number have different domains (the
