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CC Intro Logic 11-18
Introductory Logic by James Nance & Douglas Wilson, 4th ed.
Question | Answer |
---|---|
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). |
Quantity of statement | Identifies whether the statement is Universal (all and no) or particular (some and some...not) |
Quality of statement | Identifies whether the statement is affirmative or negative. |
"A" statements are... | Universal affirmative |
"E" statements are... | Universal negative |
"I" statements are... | Particular affirmative |
"O" statements are... | Particular negative |
Contradiction | Always have opposite truth values (A&O) (I&E) |
Contrariety | Can both be false but can't both be true. (A&E) |
Subcontrariety | Cab both be true but can't both be false. (I&O) |
Subimplication | If the universal is true, then the particular must be true. (A-I) (E-O) |
Superimplication | If the particular is false, then the universal must also be false. (I-A) (O-E) |