Introductory Logic by James Nance & Douglas Wilson, 4th ed.
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Tell the process for changing a sentence into standard form. | 1. Identify and write down the entire subject.
2. Choose the proper "to be" verb.
3. Rewrite the entire predicate as a predicate nominative (a noun).
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| Quantity of statement | Identifies whether the statement is Universal (all and no) or particular (some and some...not)
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| Quality of statement | Identifies whether the statement is affirmative or negative.
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| "A" statements are... | Universal affirmative
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| "E" statements are... | Universal negative
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| "I" statements are... | Particular affirmative
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| "O" statements are... | Particular negative
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| Contradiction | Always have opposite truth values (A&O) (I&E)
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| Contrariety | Can both be false but can't both be true. (A&E)
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| Subcontrariety | Cab both be true but can't both be false. (I&O)
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| Subimplication | If the universal is true, then the particular must be true. (A-I) (E-O)
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| Superimplication | If the particular is false, then the universal must also be false. (I-A) (O-E)
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