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6 months ago
  1. \item \ifassignmentsheet \points{5} \fi
  2. Use the lazy encoding approach to check whether the formula $\varphi$ in $\EUF$ is satisfiable.
  3. \begin{align*}
  4. \varphi =& (\clause{\lnot (f(a)=f(b)); (f(a)=c); (a=b)}) \land (\clause{\lnot (f(a)=c); (a=b); \lnot (f(c)=a)})~\land\\
  5. & (\clause{(f(a)=f(b)); \lnot (f(a)=c)}) \land (\clause{\lnot (f(a)=f(b)); (a=b)})~\land \\
  6. & (\clause{\lnot (a=b); \lnot (f(c)=a)}) \land (\clause{(f(a)=f(b)); (a=b)})~\land \\
  7. & (\clause{\lnot (a=b); \lnot (f(a)=c)})
  8. \end{align*}