Question

what is obverision?
​

Answer 1

Explanation:

In traditional logic, obversion is a "type of immediate inference in which from a given proposition another proposition is inferred whose subject is the same as the original subject, whose predicate is the contradictory of the original predicate, and whose quality is affirmative if the original proposition's quality was negative and vice versa".

Answer 2

Answer:

Explanation:

A form of reference in which a negative proposition is obtained from an affirmative or,vice versa.

for example:

"None of us is immortal"  is obtained from obversion from "All of us are mortal"