Abstract
Read once branching programs are investigated for the following search problem: given a Boolean m×n matrix with m>n, find either an all-zero row, or two 1's in some column. Exponential lower bounds are proven if the model is restricted by requiring the branching program either to finish one row of queries before asking queries about another row or put the dual column restriction. A special class of resolution proofs is investigated for P H Pnm that operate with positive clauses of rectangular shape and termed it rectangular calculus. The rectangular calculus is shown to be equivalent to the column model on one hand, and to the transversal calculus on the other hand.
| Original language | English |
|---|---|
| Pages (from-to) | 739-748 |
| Number of pages | 10 |
| Journal | Conference Proceedings of the Annual ACM Symposium on Theory of Computing |
| DOIs | |
| State | Published - 1997 |
| Externally published | Yes |
| Event | Proceedings of the 1997 29th Annual ACM Symposium on Theory of Computing - El Paso, TX, USA Duration: 4 May 1997 → 6 May 1997 |
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