PHIL 210 Study Guide - Quiz Guide: Modus Ponens, Internal Fixation, Modus Tollens

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Lecture 1 Quiz Notes
Provide an example of:
An argument in the form of Modus Tollens, with a false conclusion.
If P then Q
Not Q
Therefore, not P
If Abigail wants to apply for the Canadian forces, she must have volunteered in
the past
Abigail has not volunteered in the past
Therefore, she does not want to apply for the Canadian Forces
An instance of denying the antecedent with a true conclusion
1. If P then Q
2. Not P
Therefore, not Q
If I want the new Iphone X, I must take extra hours at work
I do not want the new iphone X
Therefore, I did not take extra hours at work
A valid argument with a true conclusion that is not sound
If P then Q → if I have wings, then I can fly to the moon
P → I have wings
Therefore Q → therefore, I can fly to the moon
Simplification
P and Q
Therefore, P
o Amanda and Alex both want to quit their jobs and become circus performers
o Therefore, Amanda wants to become a circus performer
Conjunction
P
Q
Therefore, P and Q
o Lilly enjoys taking cold showers in the morning
o Tom enjoys taking cold showers in the morning
o Therefore, Lilly and Tom both enjoy taking cold showers in the morning
Addition
P
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