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PHIL 110
Conditional Formats
7
Philosophy
Undergraduate 1
10/31/2013
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Term
If p, then q.
p.
Therefore q.
 Definition
Modus Ponens
Term
If p then q.
Not q.
Therefore not p.
 Definition
Modus Tollens
Term
Either p or q.
Not p.
Therefore q.
 Definition
Disjunctive Syllogism
Term
Either p or q.
Not q.
Therefore p.
 Definition
Disjunctive Syllogism
Term
If p then q.
If q then r.
Therefore, if p then r.
 Definition
Hypothetical Syllogism
Term
If p then q.
q.
Therefore p.
 Definition
Affirming the Consequent (invalid)
Term
If p then q.
Not p.
Therefore not q.
 Definition
Denying Antecedent (invalid)
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