Final answer:
An indirect proof is a proof technique used in mathematics to prove a statement by assuming the opposite of what is to be proven and showing that it leads to a contradiction.
Step-by-step explanation:
An indirect proof is a proof technique used in mathematics to prove a statement by assuming the opposite of what is to be proven and showing that it leads to a contradiction. This is done by assuming the opposite of the statement and then using deductive reasoning to derive a contradiction. Indirect proofs can be useful when a direct proof is difficult or not obvious.