16 lines
815 B
Markdown
16 lines
815 B
Markdown
- used to verify UNSAT results
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- Idea is to derive empty clause
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# RUP
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- Reverse Unit Propagation
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- Proofs only by [Unit propagation](SAT_in_general#Special Case Unit Resolution)
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# RAT
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- Reverse Asymmetric Tautology
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- Idea: If all Resolutions end in Tautologies (or tautology by RUP) clause can be removed
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- Supports more than just [UP](SAT_in_general#Special Case Unit Resolution)
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- Way to represent [Blocked Clause removal](Preprocessing_Inprocessing#Blocked Clauses / Blocked literal)
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- Replace need for tautology with RUP condition
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# Redundancy
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- A clause in a Formula is redundant
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- Simplifying F by setting C to false implies any Formula simplified by another assignment
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- $F_\alpha \models F_\omega$ , where $\omega$ satisfies $C$
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- The idea of Propagation Redundancy (PR) is more general even than RAT |