3. What is CONVERSION?
-it is restraining the truth of the
proposition by interchanging the
subject and the predicate of the
original proposition w/out over
extending the quantity or either of
the term.
What is OBVERSION?
- is a method of re-expressing truth
by changing the quality of the copula
so that the affirmative is rendered
negative and the negative is
rendered affirmative.
What is CONTRA POSITION?
- is a combination of conversion
and obversion.
It has a interchangeable subject
and predicate.

4. -it is the opposite
of obversion for it
uses the
contradictory of
the original
subject.

5. There are TWO (2) types of inversion.
1. First type is called PARTIAL or SIMPLE
inversion. The quality is changed , but the
predicate is the same as in the original
proposition.
2. Second type is called COMPLETE inversion.
The quality is unchanged, but the predicate is
the contradictory of the original predicate.
 Both types consist in the formulation of a new
proposition whose subject is the contradictory
of the original proposition.

6. The original proposition is
called the invertend, the
new proposition the
inverse, and the process
itself inversion.

8. Simple or Partial
Proposition New proposition.
Subject Use the
contradictory of the
subject .
Copula Change
Predicate Put the original
predicate.

9. Proposition New Proposition.
Subject Use the contradictory
of the subject.
Copula Do not change.
Predicate Use the contradictory
of the predicate.
Complete

11. Model in Type 1 (PARTIAL or SIMPLE)
A to O
I to E
A (Affirmative & either
universal or singular )
O (Negative & particular)
I (Affirmative & Particular)
E (Negative & Universal or
Singular)
NOTE:

12. Models in Type 2 (COMPLETE)
A to I
E to O
A (Affirmative & either
universal or singular )
I (Affirmative & Particular)
E (Negative & Universal or
Singular)
O (Negative & particular)
NOTE:

13. Another type is the
OBSERVE of Type 1, and
is therefore sometimes
called the “obverted
inverse,” as opposed to
Type 1 which is called
the “simple inverse”.

15.  If you subject an A proposition to the
following processes, you finally get its
inverse.
INVERTEND: A. Every S is a P. (“Every cat is an animal.”)
Obvert to: E. No S is a non-P. (“No cat is a non-animal.”)
Convert to: E. No non-P is an S. (“No non-animal is a cat.”)
Obvert to: A. Every non-P is a non-S. (“Every non-animal
is a non-cat”)
Convert to: I. Some non-S is a non-P. (“Some non-cat is
non-animal”) => This is inverse, Type 2
Obvert to: O. Some non-S is not a P. (“Some non-cat is
not an animal.”) => This is inverse, Type 1

16.  If you subject an E proposition to the
following processes, you finally get its
inverse. Note that you must convert first
and then obvert.
INVERTEND: E. no S is P. (“No cat is a dog.”)
Convert to: E. No P is an S. (“No dog is a cat.”)
Obvert to: A. Every P is a non-S. (“Every dog is a non-
cat.”)
Convert to: I. Some non-S is a P. (“Some non-cat is a
dog”) => This is inverse, Type 1
Obvert to: O. Some non-S is non-P. (“Some non-cat is
not a non-dog.”) => This is inverse, Type 2

17. The value of studying inversion
lies principally in the facility it
gives us in recognizing
quantitative relationship of the
subject and predicate. ^-^

19. Submitted by:
Leader: Orlaine Gamilla
Secretary: Jelyan Garanganao
Members:
Hanjie Sales
Carmela Joy Serantes
Jenalyn Villarosa
Submitted to: