A hierarchy result for read-once branching programs with restricted parity nondeterminism

被引:1
作者
Savicky, P [1 ]
Sieling, D
机构
[1] Acad Sci Czech Republ, Inst Comp Sci, Prague, Czech Republic
[2] Univ Dortmund, FB Informat, D-44221 Dortmund, Germany
关键词
read-once branching programs; restricted parity nondeterminism; lower bounds on complexity; hierarchy;
D O I
10.1016/j.tcs.2005.03.016
中图分类号
TP301 [理论、方法];
学科分类号
081202 ;
摘要
Restricted branching programs are considered in complexity theory in order to study the space complexity of sequential computations and in applications as a data structure for Boolean functions. In this paper (circle plus, k)-branching programs and (v, k)-branching programs are considered, i.e., branching programs starting with a circle plus- (or V-)node with a fan-out of k whose successors are k read-once branching programs. This model is motivated by the investigation of the power of nondeterminism in branching programs and of similar variants that have been considered as a data structure. Lower bound methods and hierarchy results for polynomial size (circle plus, k)- and (V, k)-branching programs with respect to k are presented. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码:594 / 605
页数:12
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