CONVERSION

In Logic, a proposition is said to be converted when the terms are so transposed that tlie subject is made the predicate, and vice vers^. All logical conversion is illative; i. e. the truth of the converse follows from that of the original. Conversion is either " simple " or " per accidens." Universal negatives (denoted by the sign E) and particular affirmatives (I) can be converted simply, retaining both quantity and quality: thus, " No virtuous man is a rebel; " " No rebel is a virtuous man." Conversion per accidens changes either quantity or quality. Universal affirmatives (A) are converted by changing the quantity; as. "All oaks are trees;" " Some trees are oaks." Particular negatives (O) by changing the quality, considering tlie negative as attached to the predicate instead of the copula: the proposition Is [s. 291]