Logic: Equivalence and Opposition

Front

A statement using terms in which we say something is or is not something else ~or~ a statement which expresses truth or falsity

Back

proposition

Front

the mental act of thinking that one thing is or is not something else.

Back

judgment

Front

when statements have the same subject and predicate, but disagree about quality and/or quantity

Back

opposition

Front

When two statements that make the exact same claim about the world but are formatted differently, they are

Back

equivalent

Front

On the square of opposition, _____ tumbles and _______ flies

Back

truth, falsity

Front

Obvert the following: All (pickles) are (disgusting)

Back

No (pickles) are (non-disgusting), No pickles are non-disgusting, No (pickles) are (not disgusting), No pickles are not disgusting

Front

Obvert the following: Some (slippers) are not (fuzzy)

Back

Some (slippers) are (non-fuzzy)

Front

Convert the following: No (nickels) are (worth 11 cents)

Back

No (things worth 11 cents) are (nickels), No things worth 11 cents are nickels, No (worth 11 cents) are (nickels), No worth 11 cents are nickels

Front

Contrapose the following: Some (dollar bills) are not (phonies)

Back

Some (non-phonies) are (dollar bills), Some non-phonies are dollar bills, Some (not phonies) are (dollar bills), Some not phonies are dollar bills

Front

Contrapose the following: All (freckled bananas) are (sickly)

Back

All (non-sickly things) are (non-freckled bananas), All not sickly things are not freckled bananas, All (non-sickly) are (non-freckled bananas), All non-sickly are non-freckled bananas