SOLUTION: what kInd of process do you use to show that a statement must be true because it cannot be false ?

Question 397933: what kInd of process do you use to show that a statement must be true because it cannot be false ?
Found 2 solutions by stanbon, richard1234:
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Indirect Proof.
Cheers,
Stan H.
Answer by richard1234(7193) (Show Source): You can put this solution on YOUR website!
Typically called an indirect proof, or a proof by contradiction.
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