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9 lines
336 B
9 lines
336 B
\textbf{Definition - Pure Literal.} A literal is \emph{pure} if its negation does not appear in the formula.
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Consider the following clauses $c_1$ and $c_2$:
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\begin{itemize}
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\item $c_1 = \{a, b, \neg c\}$
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\item $c_2 = \{\neg b, \neg c, d\}$
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\end{itemize}
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$\neg c$ is a pure literal, since it does not appear in the positive phase.
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