👉 Untwinable in mathematics refers to a mathematical object that can be expressed as two or more different expressions with no common factors. In other words, it is a mathematical construct that can have infinitely many representations. For example: - 2 + 3 = 5 (This is not an untwinable expression because the sum of 2 and 3 is 5) - 4x + 1 = 5 (This is an untwinable expression because it has a common factor