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2 be logical

Introductory Logic Lesson 27 Immediate Inferences

QuestionAnswer
immediate inference a statement that can be INFERRED DIRECTLY from another statement
converse a statement that REVERSES the S & P of another statement
A converse is only valid with ___________ statements. E & I
obverse a statement of the OPPOSITE quality with a NEGATED predicate
An obverse is valid for __________ statements. A, E, I, & O
complement the set of all terms not included in the given term
contrapositive a statement that reverses and negates both the subject and predicate of the original
The contrapositive is valid only for __________ statements. A & O
An immediate inference resembles a syllogism w/ only one premise & is related to the concepts of ___________________ & equivalence. implication
"All things that glitter are gold" is an A statement and therefore has an obverse and a contrapositive.
The obverse for "All things that glitter are gold" is "No things that glitter are non-gold."
The contrapositive for "All things that glitter are gold" is "All non-gold is a non-glittering thing."
"No emperors were philosophers" is an E statement and therefore has an obverse and a converse.
The obverse for "No emperors were philosophers" is "All emperors were non-philosophers."
The converse for "No emperors were philosophers" is "No philosophers were emperors."
Created by: MrsHough
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