A Transformational Decision Procedure for Non-Clausal Propositional Formulas
<|reference_start|>A Transformational Decision Procedure for Non-Clausal Propositional Formulas: A decision procedure for detecting valid propositional formulas is presented. It is based on the Davis-Putnam method and deals with propositional formulas that are initially converted to negational normal form. This procedure splits variables but, in contrast to other decision procedures based on the Davis-Putnam method, it does not branch. Instead, this procedure iteratively makes validity-preserving transformations of fragments of the formula. The transformations involve only a minimal formula part containing occurrences of the selected variable. Selection of the best variable for splitting is crucial in this decision procedure - it may shorten the decision process dramatically. A variable whose splitting leads to a minimal size of the transformed formula is selected. Also, the decision procedure performs plenty of optimizations based on calculation of delta-sets. Some optimizations lead to removing fragments of the formula. Others detect variables for which a single truth value assignment is sufficient. The latest information about this research can be found at http://www.sakharov.net/valid.html<|reference_end|>
@article{sakharov2003a,
    title={A Transformational Decision Procedure for Non-Clausal Propositional
  Formulas},
    author={Alexander Sakharov},
    journal={arXiv preprint arXiv:cs/0306035},
    year={2003},
    archivePrefix={arXiv},
    eprint={cs/0306035},
    primaryClass={cs.LO cs.CC}
}