Intro Logic: Lesson 12

Terms in this set (11)

Categorical Statements
A statement that affirms or denies something about a given subject.
Four forms of categorical statements
1. All S are P. (Universal; Affirmative)
2. No S are P. (Universal; Negative)
3. Some S are P. (Particular; Affirmative)
4. Some S are not P. (Particular; Negative)
Subject
The term being described or about which something is asserted
Predicate
The term that describes or asserts something about the subject.
Quantity
The scope of a statement's claim about the extension of the subject: universal or particular.
Universal
When a statement makes a claim about the entire extension of the subject. (All or No)
Particular
When a statement makes a claim about part of the extension of the subject. (Some or Some...not)
Quality
The positive or negative nature of a statement's claim about the subject: affirmative or negative.
Affirmative
When a statement affirms something of the subject. (All or Some)
Negative
When a statement denies something of the subject. (No or Some...not)
Rules for translating categorical statements into standard categorical form
1. The statements must begin with the words all, no or some.
2. The verb must be a verb of being: is, are, was, were, will be, etc.
3. Both the subject and the predicate must be a noun or noun phrase.
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