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Logical Validity

Modal Definition:
An argument is valid whenever the truth of its premises guarantees the truth of its conclusion. It is impossible for a valid argument to have true premises but a false conclusion. However, logical validity alone does not guarantee a true conclusion: an argument can be valid with false premises.

Formal Definition:
An argument is valid if, and only if, it is a particular instance of a valid logical form. It is the structure of and relations between sentences that either guarantees or fails to guarantee validity.

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