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

by George Hastings McNair

(8) If it rains, I shall not go.

(9) He is either sane or insane.

2. KINDS OF LOGICAL PROPOSITIONS.

There are three kinds of logical propositions; namely, categorical, hypothetical and disjunctive.

A categorical proposition is one in which the assertion is made unconditionally. An hypothetical proposition is one in which the assertion depends upon a condition. A disjunctive proposition is one which asserts an alternative.

THE THREE KINDS ILLUSTRATED:

(1) “Every dog has his day.” Categorical.

(2) “If you do your best, success will reward you.” Hypothetical.

(3) “He is either stupid or indolent.” Disjunctive.

(4) “All vices are reprehensible.” Categorical.