Show that the equations are not absolutely true.
(5) Indicate the true relation between the subjects and predicates of the foregoing by using the algebraic signs > and <.
(6) Why cannot an A be derived from an I?
(7) Why cannot an O be derived from an A?
(8) The basic principle of obversion is “Two negatives are equivalent to one affirmative.” Show by means of circles thatthis is not absolutely true; take as an illustrative proposition, “No men are not mortal.”
(9) Show that agreeable and disagreeable are not contradictory terms.
(10) Why should the logician class individual propositions as universal?
(11) Show by circles that there is a difference in signification between, “Some men are not wise” and “Some men are not-wise.”
(12) Show by circles that the O proposition cannot be converted.
(13) “The I proposition cannot be contraverted.” Make this clear.