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(A) and (O) preserve truth value. (E) and (I) do not: So, this time, the top and bottom (A & O) preserve the truth value, while the middle two (E & I) do not. As with obversion, a valid inference CAN immediately be derived for two of the four types of categorical proposition, but NOT for the other two. For instance, if you have an (A) or an (O) proposition as a true premise, you can contrapose it and automatically conclude that it is also true. On the other hand, if you have a true (E) or an (I)

Author

Kid-an Kibrie

Language

EN