Logical Equivalnece Flashcards
An inference in which the meaning of the original
proposition is made clear in the second by the use
and removal of negatives, and by interchanging the
position of the subject and predicate.
eduction
This is a kind of logical
equivalence that proceeds
by interchanging the
subject and the predicate
terms of a proposition.
conversion
in conversion, The original proposition is
called as the ___,
while the inferred
proposition is called as the
____.
convertend
converse
rules of conversion
- Interchange the subject and
predicate terms. - Retain the quality of the
proposition. - Do not extend any term.
it means the
particular quantity is raised as a
universal quantity.
extension
types of conversion
simple
partial
both the quantity and
quality of the convertend are
retained. (conversion)
simple
only the quality is
retained. (conversion)
partial
O propositions cannot be converted.
true
This is a process of eduction
wherein the new proposition
is formulated by changing
affirmative propositions into
negative propositions.
obversion
in obversion, The original proposition is
called as the ______, while
the inferred proposition is
called as the _______.
obvertend
obverse
rules of obversion
- Retain the subject and the quantity.
- Change the quality of the
proposition. - Compliment the predicate term.
The use of the term “non” denotes that the term (subject/predicate) is a
complimentary class of the provided term
true
If a given term has already a prefix ‘non’ to it (i.e. non-cute) and you are instructed
to compliment it, do not put double ‘non’ to it anymore (non-noncute) and just
revert it to the original term (cute)
true
Using the prefix “non” in the case of “non-honest” denotes the ‘group of people
that are not honest’, hence in other terms they can be ‘liars’, ‘deceivers’, etc.;
Instead of using a contrary term, we opt to use the prefix ‘non’ instead
true
