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logic week 6

by: Victoria Jackson

logic week 6 PHIL 2330

Victoria Jackson
Texas State
GPA 3.2

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About this Document

the three ways to analyze the relationships of the four logical standard forms.
Elementary Logic
Class Notes
25 ?




Popular in Elementary Logic


This 1 page Class Notes was uploaded by Victoria Jackson on Tuesday October 11, 2016. The Class Notes belongs to PHIL 2330 at Texas State University taught by Gilbertson in Fall 2016. Since its upload, it has received 4 views. For similar materials see Elementary Logic in PHILOSOPHY AND HUMANITIES at Texas State University.

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Date Created: 10/11/16
Logic week 6 3 ways to change the categorical proposition. Obverse, converse, and contraposition. ● Converse- ○ When taking the converse of a proposition all you do is switch the subject and the predicate terms. ○ Ex. Some S are P = Some P are S ○ This does not work for all categorical propositions though ■ This only works for I & E statements NOT A&O ● Obverse- ○ When taking the obverse of a proposition, you change the QUALITY of the proposition and change the predicate term with its complement. ■ Ex. All S are P = No S is non-P ■ Ex. All Whales are mammals = No whales are not mammals. ○ This works for ALL logical forms. ● Contraposition ○ When taking the contraposition of a categorical proposition you switch the predicate and subject terms and then change the subject and predicate terms to their complements. ■ Ex. All S are P = All non-S are non-P ○ This works for the A&O terms NOT I&E! *Complements Review- The complement of a term is everything that is not included with that term. So the complement of sandpaper is everything that is not sandpaper, or non-sandpaper.


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