🚧 Mid of 6.4
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$\mathbf{t}$ corresponds to _____, a contradiction $\mathbf{c}$ corresponds
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to _____, and the negation operation, denoted $\neg$, corresponds to _____.
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$\cup$;$\cap$,$U$,$\emptyset$,$^c$
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2. The operations of $+$ and $\cdot$ in a Boolean algebra are generalizations of
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the operations of _____ and _____ in the set of all statement forms in a
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given finite number of variables and the operations of _____ and _____ in the
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set of all subsets of a given set.
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$\vee$;$\wedge$;$\cup$;$\cap$
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3. Russell showed that the following proposed "set definition" could not
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actually define a set: _____.
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the set of all sets that are not elements of themselves
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