Proof
| Proposition | Derivation |
|---|---|
| Given | |
| Given | |
| Material implication | |
| Transposition | |
| Hypothetical syllogism | |
| Simplification | |
| Hypothetical syllogism | |
| Material implication |
|}
Read more about this topic: Destructive Dilemma
Famous quotes containing the word proof:
“Talk shows are proof that conversation is dead.”
—Mason Cooley (b. 1927)
“The source of Pyrrhonism comes from failing to distinguish between a demonstration, a proof and a probability. A demonstration supposes that the contradictory idea is impossible; a proof of fact is where all the reasons lead to belief, without there being any pretext for doubt; a probability is where the reasons for belief are stronger than those for doubting.”
—Andrew Michael Ramsay (16861743)
“Right and proof are two crutches for everything bent and crooked that limps along.”
—Franz Grillparzer (17911872)