Here are a few examples from section 4.4. See if you can figure out whether they are conversions, obversions, or contrapositions and then state the truth value.
1. Some astronomers are interested in biology.
Therefore, some biologists are interested in astronomy.
2. No families are perfect.
Therefore, no imperfections are non- families.
3. All people who know how to swim are competitive swimmers.
Therefore, all competitive swimmers are people who know how to swim.
4. Some hired assassins are just average human beings.
Therefore, some hired assassins are not just average human beings.
What do you think?
I am going to start with 1, and say it is a conversion. And I am going to say that it is the same truth value as the given statement.
ReplyDeleteI agree with you. When I was creating 1, I went on the basis that it was a conversion with the same truth value. Good work :).
ReplyDelete