Validity & Form Flashcards

1
Q

Hypothetical Syllogism

A

If P, then Q.
If Q, then R.
Therefore,
If P, then R.
If you party every weekend you will be too tired to study.
If you are too tired to study then you will fail the exam.
therefore,
if you party every weekend then you will fail the exam.

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2
Q

Simplified Dilemma

A
Either P or Q.
If P then R
If Q then R
Therefore, R
Either I will go to Thailand or india.
If I go to Thailand I will get a suntan
If I go to India I will get a suntan
therefore, I will get a suntan.
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3
Q

Disjunctive Syllogism

A

Either P or Q
It is not the case that P
therefore Q - Denying the antecedent - Fallicious.

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4
Q

Modus Ponens

A

If P then Q
P
therefore Q
Affirming the antecedent - Valid

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5
Q

Modus Tollens

A

If P then Q
not Q
Therefore not P - Denying the consequent - Valid.

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