Formal Proof
| Proposition | Derivation |
|---|---|
| Given | |
| Given | |
| Material implication | |
| Disjunctive syllogism |
Read more about this topic: Modus Tollens
Famous quotes containing the words formal and/or proof:
“The bed is now as public as the dinner table and governed by the same rules of formal confrontation.”
—Angela Carter (1940–1992)
“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 (1686–1743)