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Chapter 3: Problem 32
Write the negation of each statement. I do not apply myself and I succeed.
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Use Euler diagrams to determine whether each argument is valid or invalid. All insects have six legs. No spiders have six legs. Therefore, no spiders are insects.
Translate each argument into symbolic form. Then determine whether the argument is valid or invalid. You may use a truth table or, if applicable, compare the argument's symbolic form to a standard valid or invalid form. (You can ignore differences in past, present, and future tense.) There must be a dam or there is flooding. This year there is flooding. \(\therefore\) This year there is no dam.
Translate each argument into symbolic form. Then determine whether the argument is valid or invalid. "I do know that this pencil exists; but I could not know this if Hume's principles were true. Therefore, Hume's principles, one or both of them, are false."
Use a truth table to determine whether the symbolic form of the argument is valid or invalid. $$ \begin{aligned} &\sim p \wedge q \\ &\frac{p \leftrightarrow r}{\therefore p \wedge r} \end{aligned} $$
Write an original argument in words for the contrapositive reasoning form.
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