try again chapter 9 Flashcards
What are the three ways in which statements can be converted into their logical equivalents?
obversion, conversion, contraposition.
The two-step process for obverting a statement is: 1) Change the quality of the statement; and 2) Negate the predicate
true
Which statements can be obverted
all four
You______ a statement by interchanging the subject-term and the predicate-term.
convert
Which statements can be converted?
e and i
Partial conversion is the only way to convert which statement?
a
The three-step method for controposing a statement is: 1) Obvert the statement; 2) Convert the statement; and 3) Obvert the statement again.
true
Which statements can be contraposed?
a and o
Obvert the following statement: All men are mortal.
No men are immortal
Contrapose the following statement: All men are mortal.
All immortal things are not men.
Convert the following statement: All men are mortal.
Some mortal things are men.
Obvert the following statement: Some men are happy.
Some men are not unhappy
