Modus Ponens and Modus Tollens
1. | This student
is not honest. |
by modus tollens |
2. | I will
take my umbrella. |
by modus ponens |
3. | c |
by modus ponens |
4. | Today is
not Monday |
by modus tollens |
(If the solution to problem 4 is not immediately
obvious, try rewriting the sentence as "If today is Monday, then I
will bring my lunch.")