Categorical Statements
The general form for the four categorical propositions
What is
All S is P
No S is P
Some S is P
Some S is not P
Opposite Truth Values
What is Contradiction
The relationship between A & O statements
What is Contradiction
subject and predicate terms are interchanged
What is conversion?
If A is true, then O must be _?_
What is False
Universal Affirmative Proposition
What is A
or
What is All S are P
Both cannot be false, but both can be true.
What is Subcontrary
The relationship between O & E
What is subalternate?
Quality is reversed and predicate is replaced with its complement.
What is obversion
If I is false, then O must be _?_
What is true
Universal Negative Proposition
What is E
or
What is No S are P.
Both cannot be true, but both can be false
What is Contrary
The relationship between E & A
What is Contrary
subject is replaced with complement of the predicate and predicate is replaced with complement of the subject
What is contraposition
If O is true, then E must be _?_
What is uncertain
Particular Negative proposition
What is O
or
What is Some S are not P.
The rule for truth in subalternation
What is truth sinks
The relationship between I & O
What is Subcontrary
This type of immediate inference is valid for all types of propositions.
What is obversion?
If I is false, then A must be _?_
What is False
Particular Affirmative Proposition
What is I
or
What is Some S are P.
The rule for falsity in subalternation
What is falsity floats
The relationship between A & I
What is Subalternate
How are the two propositions below related?
All chocolate bars are popular treats.
No chocolate bars are non-popular treats.
What is obversion
If E is true, then O must be _?_
What is True