An argument is valid iff it is impossible for all the premises to be true while the conclusion is false — equivalently, iff the conjunction of the premises implies the conclusion is a tautology. Validity is a purely formal/structural…
An argument is valid iff it is impossible for all the premises to be true while the conclusion is false — equivalently, iff the conjunction of the premises implies the conclusion is a tautology. Validity is a purely formal/structural…