This preview shows pages 1–4. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: 12/10/2011 1 Logic and Reasoning PHIL 102 [13] 12 Oct 2011 Rest of chapter 7 Deductive reasoning: Categorical logic VENN Diagrams  Venn diagram = graphical representation of the logical relations Invented by John Venn 1834  1923 Four types of categorical statements subject predicate form (shaded region = empty) Asentences All S are P Four types of categorical statements subject predicate form Esentences No S are P Four types of categorical statements subject predicate form Isentences Some S are P Four types of categorical statements subject predicate form Osentences Some S are not P S P 12/10/2011 2 S P A E O I When do two categorical statements say the same thing? Examples: No S are P = No P are S When do two categorical statements say the same thing? Examples: No S are P = No P are S When do two categorical statements say the same thing? Examples: Some S are P = Some P are S When do two categorical statements say the same thing? Examples: Some S are P = Some P are S When do two categorical statements say the same thing? Examples: All S are P = No S are P 12/10/2011 3 When do two categorical statements say the same thing? Examples: All S are P No S are P When do two categorical statements say the same thing? Examples: All S are P No S are nonP When do two categorical statements say the same thing?...
View Full
Document
 Fall '11
 rug

Click to edit the document details