Proof
| Proposition | Derivation |
|---|---|
| Given | |
| Given | |
| Transposition | |
| Law of the Excluded Middle | |
| Conjunction | |
| Constructive dilemma | |
| Material implication |
Read more about this topic: Hypothetical Syllogism
Famous quotes containing the word proof:
“It comes to pass oft that a terrible oath, with a swaggering accent sharply twanged off, gives manhood more approbation than ever proof itself would have earned him.”
—William Shakespeare (15641616)
“If some books are deemed most baneful and their sale forbid, how, then, with deadlier facts, not dreams of doting men? Those whom books will hurt will not be proof against events. Events, not books, should be forbid.”
—Herman Melville (18191891)
“To cease to admire is a proof of deterioration.”
—Charles Horton Cooley (18641929)