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sav08:normal_forms_for_first-order_logic [2009/05/14 15:59] vkuncak |
sav08:normal_forms_for_first-order_logic [2009/05/14 16:02] vkuncak |
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| Note: it is better to do PNF and SNF //for each conjunct independently//. | Note: it is better to do PNF and SNF //for each conjunct independently//. | ||
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| ===== CNF and Sets of Clauses ===== | ===== CNF and Sets of Clauses ===== | ||
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| *$C_2=\neg R(x,y) \lor R(x,f(y,z)))$ | *$C_2=\neg R(x,y) \lor R(x,f(y,z)))$ | ||
| *$C_3=P(x) \lor P(f(x,a))$ | *$C_3=P(x) \lor P(f(x,a))$ | ||
| - | *$C_4=\neg R(c,x) \vee \neg P(x)$ | + | *$C_4=\neg R(c,y) \vee \neg P(y)$ |
| === Another Example: Irreflexive Dense Linear Orders === | === Another Example: Irreflexive Dense Linear Orders === | ||