![]() ![]() The relationship between soundness and validity is easy to specify: all sound arguments are valid arguments, but not all valid arguments are sound arguments.Īlthough soundness is what any argument should aim for, we will not be talking much about soundness in this book. While the first argument was sound, the second argument was not sound, although it was valid. Compare the last two Obama examples from the previous section. But if the premises are actually true, as they are in a sound argument, then since all sound arguments are valid, we know that the conclusion of a sound argument is true. Why? Because if an argument is valid, the premises transmit truth to the conclusion on the assumption of the truth of the premises. That means that the conclusion of a sound argument will always be true. A sound argument is a valid argument that has all true premises. Soundness is defined in terms of validity, so since we have already defined validity, we can now rely on it to define soundness. A good argument is not only valid, but also sound.
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