Valid/Invalid Deductive Arguments >> - The Logic Cafe

An argument is . invalid. if and only if it is not valid. Or in other words, to say that an argument is valid is to say that if the premises are true, then the conclusion must also be true. Finally, A . sound. argument is a valid argument in which the premises are all true. In other words, an argument is sound if and only if it is valid and has ... ................
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