MODUS TOLLENS - PowerPoint PPT Presentation
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MODUS TOLLENS
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MODUS TOLLENS If P then Q Not Q therefore not P MODUS TOLLENS If P then Q Not Q therefore not P If Jane lives in Paris then Jane lives in France. – PowerPoint PPT presentation
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Title: MODUS TOLLENS
1
MODUS TOLLENS
- If P then Q
- Not Q
- therefore not P
2
If Jane lives in Paris then Jane lives in France.
3
If Jane lives in Paris then Jane lives in
France. Jane does not live in France.
Therefore Jane does not live in Paris
4
If
Jane lives in Paris
then
Jane lives in France.
It is not true that
Jane lives in France.
Therefore it is not true that
Jane lives in Paris
5
If
The weapon is a gun or a knife
then
The butler is the murderer.
It is not true that
The butler is the murderer.
