Validity Patterns Flashcards
1
Q
Affirming antecedent
A
If p then q
p
therefore q
2
Q
Denying the consequent
A
If p then q
Not q
No p
3
Q
Hypothetical syllogism
A
If p then q
If q then r
Therefore if p then r
4
Q
Disjunctive syllogism
A
Either p then q
Not p (or q)
Therefore q (or p)
