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# 5 Categorical Syllogisms - PowerPoint PPT Presentation

5 Categorical Syllogisms. 5.3 Rules and Fallacies. Categorical Syllogisms. There are 5 rules for and 5 corresponding fallacies that beset categorical syllogisms. They are: The middle term must be distributed at least once ( fallacy: Undistributed Middle ) All Tacos are Messy things

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## PowerPoint Slideshow about ' 5 Categorical Syllogisms' - margaret-johnston

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### 5 Categorical Syllogisms

5.3 Rules and Fallacies

There are 5 rules for and 5 corresponding fallacies that beset categorical syllogisms. They are:

• The middle term must be distributed at least once (fallacy: Undistributed Middle)

All Tacos are Messy things

All Sandwiches are Messy things

All Sandwiches are Tacos

All Messy things are Fun

All Tacos are Messy things

All Tacos are Fun

• If a term is distributed in the conclusion, it must be distributed in a premise (fallacies: illicit major or illicit minor)

• Two negative premises are not allowed (fallacy: Exclusive premises)

• A negative premise requires a negative conclusion, and a negative conclusion requires a negative premise (fallacies: Drawing an affirmative conclusion from a negative premise or Drawing a negative conclusion from affirmative premises)

• If both premises are universal, the conclusion cannot be particular (fallacy: existential fallacy)

T

T

S

F

M

M

Construct these syllogisms and test:

IAI-2

EIO-1

IEO-1

EOO-4

AII-3

AAI-4