👉 The term "unannihilative" refers to a mathematical concept where a function or operation is defined only for certain values of its input, and not for all possible values. For example, in a set theory context, if we define a function \(f : \mathbb{N} \to \mathbb{R}\), then \(f(0) = 1\) and \(f(n+1) = f(n) + n\) for all positive integers \(n\).
