He is honest,
∴ He is not dishonest.
9. THE TWO KINDS OF DISJUNCTIVE ARGUMENTS.
The two forms of disjunctive arguments are the one which by affirming denies and the one which by denying affirms. The former is known by the Latin words “modus ponendo tollens”; while the latter is termed the “modus tollendo ponens.”
ILLUSTRATIONS:
(1) By affirming denies.
The defendant is either guilty or innocent,
He is guilty,
∴ He is not innocent.
or