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MODUS TOLLENS If P then Q Not Q therefore not P.

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Presentation on theme: "MODUS TOLLENS If P then Q Not Q therefore not P."— Presentation transcript:

1 MODUS TOLLENS If P then Q Not Q therefore not P

2 If Jane lives in Paris then Jane lives in France.

3 France Paris If Jane lives in Paris then Jane lives in France.
Jane does not live in France. Therefore Jane does not live in Paris Paris France

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. Therefore it is not true that The weapon is a gun or a knife

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