👉 In mathematics, a stretchproof is a type of proof technique used in logic and set theory to prove that a statement is true. It involves using a contrapositive form of the original statement as its premise. The key idea behind the stretchproof is that if a statement A is false, then it must follow from the negation of A (i.e., the negation of A). This means that if we can prove that A is not true, then it logically follows that A itself is
