Ch 9 Obversion, Conversion, and Contraposition

which statement can be partially contraposed but isnt discused in this book?

E

which statements can be converted?

E and I

The Rule of Double Negation

a term which is not negated is equivalent to a term that is negated twice

what statements can be obverted?

all- A,I,E,O

what happens when you obvert I statements

double negative in the predicate

conversion

interchange the subject and ther predicate

what are the 3 ways to convert a statement to their logically equivalent?

obversion, conversion, contraposition

how do you partially convert the A statement All dogs are animals

some animals are dogs

obversion

1.change the quality of the sentence 2.negate the predicate

Contraposition

1.obvert the statement 2.convert the statement 3.obvert the statement

what are the 4 ways of phrasing the predicate when obverting I statements

1.place two nots at the beginning of the predicate term 2.make the second not a non- 3.place im, un, in or ir at the beginning of the predicate term 4.apply the rule of double negation

which statement can be partially converted?

A

what statements and be contraposed?

A and O