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Logic Terms and Rules: Quality and Quantity of Categorical Statements, Quizzes of Philosophy

William & Mary Philosophy

Definitions and rules for various logic terms, including affirmative and negative, universal and particular, and their relationships such as immediate inference, contradictories, contraries, subcontraries, subalteration, conversion, conversion by limitation, obversion, and contraposition. It also includes definitions for contraposition by limitation and the validity for e.

Typology: Quizzes

2011/2012

Uploaded on 03/02/2012

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TERM 1

Quality of Categorical Statement

DEFINITION 1

Affirmative or Negative

TERM 2

Quantity of Categorical Statement

DEFINITION 2

Universal - All members of teh class denoted by the subject

termorParticular - only some members of the class denoted

by the subject term

TERM 3

DEFINITION 3

All S are PUniversalAffirmative

TERM 4

DEFINITION 4

No S are PUniversalNegative

TERM 5

DEFINITION 5

Some S are PParticularAffirmative

Logic Terms and Rules: Quality and Quantity of Categorical Statements, Quizzes of Philosophy

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Quality of Categorical Statement

Affirmative or Negative

TERM 2

Quantity of Categorical Statement

DEFINITION 2

Universal - All members of teh class denoted by the subject

termorParticular - only some members of the class denoted

by the subject term

TERM 3

A

DEFINITION 3

All S are PUniversalAffirmative

TERM 4

E

DEFINITION 4

No S are PUniversalNegative

TERM 5

I

DEFINITION 5

Some S are PParticularAffirmative

O

Some S are not PParticularNegative

TERM 7

Immediate Inference

DEFINITION 7

Conclusion can be drawn from only one premise

TERM 8

A and O

DEFINITION 8

ContradictoriesBoth statements cannot be trueBoth

statements cannot be false

TERM 9

E and I

DEFINITION 9

ContradictoriesBoth statements cannot be trueBoth

statements cannot be false

TERM 10

A and E

DEFINITION 10

ContrariesBoth cannot be true, but can be falseException if

one is a necessary truth

Conversion by Limitation

Works for A statementsSwitch subject and predicateChange

from universal to particular

TERM 17

Obversion

DEFINITION 17

change the quality of the statement and replace the

predicate term with its term-complementWorks for all 4

TERM 18

Contraposition

DEFINITION 18

replace subject term with the term-complement of its

predicate termReplace predicate term with the term-

complement of its subject termWorks for A and O statements

TERM 19

Contraposition by Limitation

DEFINITION 19

Replace subject term with the term complement of the

predicate termReplace predicate term with the term

complement of the subject termChange quantity from

universal to particularValid for E