👉 Unextensible is a concept in computer science that refers to a data structure or algorithm for which it is impossible to write down its definition, without specifying how it operates. This includes both programming languages and algorithms, as well as other types of structures that are not fully defined by their syntax alone. For example, consider the following pseudocode: ``` function calculateSum: sum = 0 for i in range(1, n): sum += i^2 return
