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Aristotle’s logic is called
categorical logic.
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what are the 4 standard form categorical claims
- All S are P
- No S are P
- Some S are P
- Some S are not P
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Some S are not P letter
O
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top left, top right, bottom left, bottom right letters?
A, E, I, O
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left side of square
Affirmitive
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Right side of square
Negative
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Top Side of square
Universal
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Bottom side of square
Particular
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purpose of the square of opposition
To find the truth values of other categorical claims!
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Relationship between E and I
Contradictories
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Relationship between A and O
Contradictories
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Relationship between A and E
Contraries
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Relationship between I and O
Subcontraries
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Rule of contraries
The universal claims can‟t both be True
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Rule of contradictories
The diagonal claims have opposite Truth Value
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Rule of subcontraries
The particular claims can‟t both be False
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