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

by George Hastings McNair

But either W is not X or Y is not Z,

Hence A is not B.

This is simple because there is but one antecedent, A is B, and destructive because the conclusion is negative.

Complex Constructive Dilemma.

If A is B, W is X; and if C is D, Y is Z,

But either A is B or C is D,

Hence either W is X or Y is Z.

This is complex because there are two antecedents andtwo consequents; constructive, inasmuch as the conclusion is affirmative.

Complex Destructive Dilemma.

If A is B, W is X; and if C is D, Y is Z,