Converse, Conversion. Conversion in logic means the reversal of a
proposition's polarity, so that what was the subject becomes the
predicate, and vice versa. It is distinct from inversion as being
a logical, whereas that is merely a rhetorical process. In inversion the
subject and the predicate remain each what it was, but their usual
places are changed, and this when the inversion is natural and
justifiable gives emphasis, especially to the predicate.
Thus it comes spontaneously in rhetorical or
poetical utterance. Thus "few, few shall part where many meet."
Here few is the predicate, but has
great emphasis, not being in its natural position. The aim of
conversion, on the other hand, is to present a judgment essentially one
with that first arrived at, but in a different light, and is thus one of
the forms of immediate inference, i. e. inference not requiring any aid
from the discursive process, from the interposition of another judgment,
as in syllogism.