Sect. 1.4 reading - Truth, Validity, Soundness, Strength, and Cogency

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Last updated 8:27 PM on 9/12/26
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9 Terms

1
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valid deductive argument

an argument in which it is impossible for the conclusion to be false, given that the premises are true.

2
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invalid deductive argument

a deductive argument in which it is possible for the conclusion to be false, given that the premises are true

3
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sound argument

a deductive argument that is valid and has all true premises

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unsound argument

a deductive argument that is invalid, has one or more false premises, or both

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strong inductive argument

an inductive argument in which it is improbable that the conclusion be false given that the premises are true

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weak inductive argument

an argument in which the conclusion does not follow probably from the premises, even though it is claimed to

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total evidence requirement

the premises of an inductive argument must not exclude or overlook some crucial piece of evidence that undermines the stated premises and requires a different conclusion

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cogent argument

an inductive argument that is strong and has all true premises

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uncogent argument

an inductive argument that is weak, has one or more false premises, fails to meet the total evidence requirement, or any combination fo these.