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sav08:definition_of_resolution_for_fol [2008/04/01 18:19] vkuncak |
sav08:definition_of_resolution_for_fol [2015/04/21 17:30] (current) |
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This is the definition of resolution rule for first-order logic clauses. | This is the definition of resolution rule for first-order logic clauses. | ||
- | \[ | + | \begin{equation*} |
\frac{C \cup \{\lnot A_1\}\ \ \ D \cup \{A_2\}} | \frac{C \cup \{\lnot A_1\}\ \ \ D \cup \{A_2\}} | ||
{subst(\sigma)(C' \cup D')} | {subst(\sigma)(C' \cup D')} | ||
- | \] | + | \end{equation*} |
- | where $C'$ is renaming of $C$, where $D'$ is renaming of $D$, and where $\sigma = mgu(\{C',D'\})$. | + | where $\sigma_1$, $\sigma_2$ are renamings, $\sigma = mgu(\{subst(\sigma_1)(A_1),subst(\sigma_2)(A_2)\})$, |
+ | where $C' = subst(\sigma_1)(C)$ and $D' = subst(\sigma_2)(D)$. | ||
We will call the above rule //mgu-resolution// if we need to differentiate it from [[Non-Ground Instantiation and Resolution|instantiation followed by resolution]]. | We will call the above rule //mgu-resolution// if we need to differentiate it from [[Non-Ground Instantiation and Resolution|instantiation followed by resolution]]. | ||