Cs610 Lecture 1 Symbolic Logic Examples And Worksheet Page 12

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Can an invalid
argument have a
true conclusion?
Inverse Error: based on the assumption
ex:
If you have a BMW, then you are rich.
You don’t have a BMW.
∴
Validity and truth are different. Truth depends on reality. Validity depends on reasoning.
If an argument is valid, we are assured that the conclusion must be true whenever all the premises are
true.
If I have two heads, I am a Martian.
I have two heads.
∴I am a Martian.
CS610 Lecture 1 p. 12

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