Don't Be Contrary
Only A and E Statements
Can be Contrary
A Statement that affirms or denies something.
A Categorical Statement
Every Categorical Statement is put into how many forms?
4
Universal Affirmative Statements
A Statements
Exists between pairs of A and I statements and pairs of E and O statements.
Subimplication
Two statements that can both be false, but cannot both be true.
Contrary Statements
The term in a statement being described or about which something is asserted.
The subject of a statement
The relationship between a universal and particular statement of the same quality in which the truth of the universal necessitates the truth of the particular.
Subimplication
Universal Negative Statements
E Statements
Exists between pairs of I and A statements and pairs of O and E statements.
Superimplication
Always Opposite.
Contradictory Truth Values
The term in a statement that describes or asserts something about the subject.
The Predicate of a statement
The relationship between a universal and particular statement of the same quality, in which the falsity of the particular necessitates the falsity of the universal.
Superimplication
Particular Affirmative Statements
I Statements
No geese are felines.
Some birds are geese.
What kind of statement is "Some birds are geese."?
An I Statement
Only I and O statements
Subcontrariety
The scope of a statement's claim about the extension of the subject:
The Quantity
The Abbreviations of the categorical statements:
A, E, I, O
Particular Negative Statements
O Statements
Some convertibles are not cars.
Some Jeeps are convertibles.
What kind of statement is "Some convertibles are not cars."?
An O Statement
Two statements that can both be true but cannot both be false.
Subcontraries
The positive or negative nature of a statement's claim about the subject:
The Quality
A diagram of the basic relationships between categorical statements with the same subject and predicate.
Square of Opposition
Two statements that always have opposite truth values
Contradiction
All Terriers are dogs.
All mammals are not terriers.
What kind of statement is "All Terriers are dogs."?