logical Opposition

Question 1

The relationship between two propositions that have the same subject and predicate but have different quantity or quality.
The process of inferring or deriving from the known proposition (a proposition that is already assumed to be true or false) an opposite proposition.

Answer 1

Logical opposition

Question 2

Aka logical opposition

Answer 2

Oppositional inference

Question 3

the upgrading or adjustment of belief in the light of the play of new information upon current beliefs.
It is a process by which one proposition is arrived at and affirmed on the basis of some other proposition or propositions.

Answer 3

Inference

Question 4

kinds of inference

Answer 4

Immediate inference
mediate inference

Question 5

Kind of inference

this is a process of drawing a conclusion from only one given proposition.
example:
No man is an ape,
therefore, no ape is a man.

Answer 5

immediate inference

Question 6

Kind of Inference

this is a process of drawing a conclusion from two given propositions through the mediation of a third concept common to both propositions. It is in this kind of reasoning that there can be a real progress in human knowledge. This is considered, therefore, as the reasoning proper.
example:
All Filipinos are lovers of truth.
But Apolinario Mabini is a Filipino.
Therefore, Apolinario Mabini is a lover of truth.

Answer 6

Mediate inference

Question 7

4 Kinds of logical oppositions and their truth value

Answer 7

Contradictory opposition (CD)
Contrary opposition (CT)
Sub Contrary opposition (SC)
Sub Altern opposition (SA)

Question 8

Kind of logical opposition

all S are P (A-prop) ➡️ not all S are P (O-prop)

Answer 8

Contradictory opposition (CD)

Question 9

Kind of logical oppositions

no S are P (E-prop) ➡️ some S are P (I-prop)

Answer 9

Contradictory opposition (CD)

Question 10

Kind of logical opposition

If all Filipinos are patriotic is TRUE,
then not all Filipinos are patriotic will be FALSE.

Answer 10

Contradictory opposition (CD)

Question 11

Kind of logical opposition

If some students are studious is FALSE,
then no students are studious is TRUE.

Answer 11

Contradictory opposition (CD)

Question 12

Kind of logical opposition

All S are P (A-prop) ➡️ no S are P (E-prop)

Answer 12

Contrary opposition (CT)

Question 13

Kind of logical opposition

If all bananas are fruits is TRUE,
then No bananas are fruits will be FALSE.

Answer 13

Contrary opposition (CT)

Question 14

Kind of logical opposition

If all Filipinos are artists is FALSE,
then no Filipinos are artists is DOUBTFUL.

Answer 14

Contrary opposition (CT)

Question 15

Kind of logical opposition

Some S are P (I-prop) ➡️ Not all S are P (O-prop)

Answer 15

Sub Contrary opposition (SC)

Question 16

Kind of logical opposition

Some students are lovers of Logic is TRUE; hence, not all students lovers of Logic is DOUBTFUL.

Answer 16

Sub Contrary opposition (SC)

Question 17

Kind of logical opposition

if not all saints are martyrs is FALSE; then, some saints are Martyrs is TRUE.

Answer 17

Sub Contrary opposition (SC)

Question 18

Kind of logical opposition

All S are P. (A-prop) ➡️ some S are P (I-prop)

Answer 18

Sub Altern opposition (SA)

Question 19

Kind of logical opposition

No S are P. (E-prop) ➡️ not all S are P (O-prop)

Answer 19

Sub Altern opposition (SA)

Question 20

Kind of Logical Opposition

If all Logic students are studious is TRUE.
It follows that some Logic students are studious is also TRUE.

Answer 20

Sub Altern opposition (SA)

Question 21

Kind of Logical Opposition

If no congressman are corrupt officials is FALSE, then not all congressmen are corrupt officials is DOUBTFUL.

Answer 21

Sub Altern opposition (SA)

Question 22

Kind of Logical Opposition

If some teachers are loving persons is TRUE, then all teachers are loving persons will be DOUBTFUL.

Answer 22

Sub Altern opposition (SA)

Question 23

Kind of Logical Opposition

If some NPA rebels are criminals is FALSE, then all NPA rebels are criminals will also be FALSE.

Answer 23

Sub Altern opposition (SA)

Question 24

T ➡️ F
F ➡️ T

Answer 24

Contradictory opposition

Question 25

T ➡️ F
F ➡️ D

Answer 25

Contrary opposition

Question 26

T ➡️ D
F ➡️ T

Answer 26

Sub Contrary opposition

Question 27

T ➡️ T
F ➡️ D
T ➡️ D
F ➡️ F

Answer 27

Sub Altern opposition