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## Ignore words

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statement

A sentence which is either true or false.

self-supporting statement

A statement whose truth value can be determined from the statement itself.

tautology

A statement which is always true because of its logical structure.

self-contradiction

A statement that is false due to its logical structure.

supported statement

A statement whose truth value depends on evidence or information from outside itself.

consistent

Two statements are _____ (adj.) if they can both be true at the same time.

inconsistent

Two statements are _____ (adj.) if there is a conflict between them such that it is not possible for both statements to be true.

implication

Two statements are related by _____ (n.) if the truth of one requires the truth of the other.

logically equivalent

Two statements are _____ if they imply one another.

independent

Two statements are _____ (adj.) if the truth or falsity of one has no effect on the truth or falsity of the other.

real disagreement

An actual inconsistency between two statements: they cannot both be true at the same time.

apparent disagreement

A difference of opinion or perception.

verbal disagreement

A misunderstanding due to differing definitions for one or more words.

subject of a statement

The term being described, or about which something is asserted.

predicate of a statement

The term that describes or asserts something about the subject.

quantity

The scope of a statement's claim about the extension of the subject (universal, particular).

quality

The positive or negative nature of a statement's claim about the subject (affirmative, negative).

A statement

All S are P.

E statement

No S are P.

I statement

Some S are P.

O statement

Some S are not P.

square of opposition

A diagram of the basic relationships between statements with the same subject and predicate.

contradiction

Two statements are in _____ (n.) if and only if they always have opposite truth values (A-O, E-I).

contrariety

Two statements are related by _____ (n.) if and only if they can both be false but cannot both be true.

subcontrariety

Two statements are related by _____ (n.) if and only if both can be true but both cannot be false.

subimplication

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.

superimplication

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.