The successive applications of conversion and obversion within the process of contraposition may be given by a variety of names.
2.
Because of this, obversion can be used to determine the immediate inferences of all categorical propositions, regardless of quality or quantity.
3.
In the obversion of a particular negative to a particular affirmative the quantity of the subject also remains unchanged, and the predicate term is changed from simple negation to a term of the complementary class.
4.
In addition, obversion allows us to navigate through the traditional logically equivalent to the original statements in terms of truth-value, they are not semantically equivalent to their original statements in their standard form.
5.
This complementary term " immortal " in the first premise using the immediate inference known as obversion ( that is, " No humans are immortal . " is equivalent to " All humans are mortal . " ).
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