# Bounded Queries to SAT and the Boolean Hierarchy

@article{Beigel1991BoundedQT,
title={Bounded Queries to SAT and the Boolean Hierarchy},
author={Richard Beigel},
journal={Theor. Comput. Sci.},
year={1991},
volume={84},
pages={199-223}
}
• R. Beigel
• Published 29 July 1991
• Computer Science, Mathematics
• Theor. Comput. Sci.
123 Citations

• Computer Science
• 1993
This paper investigates the classes of languages that are decided by bounded truth-table reductions to an NP set in which evaluators do not have full access to the answers to the queries but get only partial information such as the number of queries that are in the oracle set or even just this number modulo some constant.

### Modulo Information from Nonadaptive Queries to NP

• Computer Science
Electron. Colloquium Comput. Complex.
• 1996
The classes of languages accepted by nondeterministic polynomial-time Turing machines that have restricted access to an NP oracle coincide with an appropriate level of the Boolean hierarchy when m is even or k 2m, and the results are generalized to the case when the NP machines are replaced by Turing machines accepting languages of the l th level of.

### Bounded Queries, Approximations, and the Boolean Hierarchy

This paper investigates nondeterministic bounded query classes in relation to the complexity of NP-hard approximation problems and the Boolean Hierarchy and proves that in many cases, NP-approximation problems have the upward collapse property.

### Oracles that Compute Values

• Computer Science
SIAM J. Comput.
• 1997
The difference hierarchy for partial functions does not collapse unless the Boolean hierarchy collapses, but, surprisingly, the levels of the difference and bounded query hierarchies do not interleave (as is the case for sets) unless the polynomial hierarchy collapses.

### Bounded query functions with limited output bits

• Computer Science, Mathematics
Proceedings 16th Annual IEEE Conference on Computational Complexity
• 2001
The paper explores the difference between parallel and serial queries to an NP-complete oracle, SAT, from the perspective of functions with a limited number of output bits, and shows that there exists a function with 2 bit output that cannot be computed using 3 parallel queries to SAT, unless the polynomial hierarchy collapses.

### NP trees and Carnap's modal logic

• G. Gottlob
• Computer Science
Proceedings of 1993 IEEE 34th Annual Foundations of Computer Science
• 1993
This work considers problems and complexity classes definable by interdependent queries to an oracle in NP, and shows that the following problems are all P/sup NP/[O(logn)] complete: validity-checking of formulas in Carnap's modal logic, checking whether a formula is almost surely valid over finite structures in modal logics K, T, and S4, and checkingWhether a formula belongs to the stable set of beliefs generated by a propositional theory.

### On Using Oracles That Compute Values

• Computer Science, Mathematics
STACS
• 1993
This paper focuses on complexity classes of partial functions that are computed in polynomial time with oracles in NPMV, the class of all multivalued partial functions that are computable

### Commutative queries

• Computer Science, Mathematics
Proceedings of the Fifth Israeli Symposium on Theory of Computing and Systems
• 1997
It is proved that the order of oracle queries does matter unless PH collapses, and this improves upon the previous result of Hemaspaandra, HemaspAandra and Hempel, who showed that the orders of the queries did not matter.

### 1 Commutative Queries

• Computer Science, Mathematics
• 1999
It is proved that, for solving decision problems, the order of oracle queries does not matter and, for computing functions, the orders of oracles queries does matter, unless PH collapses.

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The purpose of this paper is to present two groups of results which have turned out to have a surprisingly close interconnection. The first two results (Theorems 1 and 2) were inspired by the

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