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

by George Hastings McNair

Reduced to the categorical gives mood

A
A
A in the first figure and this we know to be valid.

(3) “If the weather had not been pleasant, I could not have come; but as the weather is pleasant, here I am.”

Arranged and antecedent and consequent indicated:

If the weather had not been pleasant (antecedent), I could not have come (consequent);

The weather is pleasant,

∴ I have come (here I am).

The minor premise denies the antecedent and consequently the argument is invalid according to the rule. (An affirmative minor premise denies a negative antecedent.)

Reduced to the categorical: