👉 Unextendable in mathematics refers to a property that a set or object cannot be extended beyond its current capacity. For example, if we have an infinite set of numbers (e.g., $\mathbb{Z}$), it is not possible for us to extend this set by adding more elements without going beyond the current size. Similarly, in algebraic structures like groups and rings, unextendable objects are those that cannot be extended beyond their defining operations or properties. In terms of programming languages,
