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Conditional
Any two propositions If P then Q
If P then Q is true if and only if either P
is false or Q is true. It is false only when P is true
and Q is false.
The truth table for
If you have Java, try it out for yourself:
Set the truth values for the propositions P and Q
around: we get if Q then P, which is the same as saying
P only if Q.
What is the truth value of P only if Q is false only when
Q is true and P is false.
For Educators Stephen Downes Guide to the Logical Fallacies Copyright © Stephen Downes, 1995-2001 stephen.downes@ualberta.ca |