Dilemmas
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Give the form of the simple destructive dilemma.
If P, then Q; and if P, then R Either not Q or not R Therefore, not P
Give the form for the simple constructive dilemma.
If P, then Q; and if R, then Q Either P or R Therefore, Q
Give the form of the complex constructive dilemma.
If P, then Q; and if R, then S Either P or R Therefore, either Q or S
Give the form of the complex destructive dilemma.
If P, then Q; and if R, then S Either not Q or not S Therefore, not P or not Q
What is a dilemma?
It is fourth and the last of compound syllogisms.
Rule 3
The conclusion must be exclusive.
Rule 1
The consequents on the major premise must ligitimately from the antecedents
Rule 2
The disjunction in the minor premise must be complete
