A Class Room Logic / Deductive and Inductive, with Special Application to the Science and Art of Teaching

by George Hastings McNair

Illustrations.

	The Given Proposition.	The Inverse.
I.	All S is P. (A)	Some not-S is not P. (O)
	All planets rotate.	Some not-planets do not rotate.
II.	No S is P. (E)	Some not-S is P. (I)
	No men are immortal.	Some not-men are immortal.

From the foregoing we are able to conclude that the inverse of “A” is found by negating the subject and changing to an “O”; while the inverse of “E” is found by negating the subject and changing to an “I.”

5. OUTLINE.

IMMEDIATE INFERENCE—​OPPOSITION—​OBVERSION, CONVERSION, CONTRAVERSION AND INVERSION.

1. The Nature of Inference.

2. Immediate and Mediate Inference.

3. The Forms of Immediate Inference.

(1) Opposition.

(a) Scheme of Opposition.