Difference between revisions of "Validity"
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== Etymology == | == Etymology == | ||
| − | From Latin ''[https://en.wiktionary.org/wiki/validus validus]'', from ''[https://en.wiktionary.org/wiki/valeo valeō]'' ("I am strong, I am healthy, I am worth"), from Proto-Indo-European <code>*wal</code> (“be strong”). | + | From Latin ''[https://en.wiktionary.org/wiki/validus validus]'', from ''[https://en.wiktionary.org/wiki/valeo valeō]'' ("I am strong, I am healthy, I am worth"), from [[Proto-Indo-European language|Proto-Indo-European]] <code>*wal</code> (“be strong”). |
== See also == | == See also == | ||
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* [https://en.wikipedia.org/wiki/Validity Validity] @ Wikipedia | * [https://en.wikipedia.org/wiki/Validity Validity] @ Wikipedia | ||
* [https://en.wiktionary.org/wiki/valid valid] @ Wiktionary | * [https://en.wiktionary.org/wiki/valid valid] @ Wiktionary | ||
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| + | [[Category:Logic]] | ||
Latest revision as of 16:40, 6 April 2016
In logic, an argument is valid if and only if it takes a form that makes it impossible for the premises to be true and the conclusion nevertheless to be false.
Discussion
It is not required that a valid argument have premises that are actually true, but to have premises that, if they were true, would guarantee the truth of the argument's conclusion.
A formula is valid if and only if it is true under every interpretation, and an argument form (or schema) is valid if and only if every argument of that logical form is valid.
Etymology
From Latin validus, from valeō ("I am strong, I am healthy, I am worth"), from Proto-Indo-European *wal (“be strong”).
