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FSTTCS
2006
Springer
13 years 11 months ago
Some Results on Average-Case Hardness Within the Polynomial Hierarchy
Abstract. We prove several results about the average-case complexity of problems in the Polynomial Hierarchy (PH). We give a connection among average-case, worst-case, and non-unif...
Aduri Pavan, Rahul Santhanam, N. V. Vinodchandran
ERSHOV
2009
Springer
14 years 2 months ago
A Complete Invariant Generation Approach for P-solvable Loops
Abstract. We present an algorithm for generating all polynomial invariants of Psolvable loops with assignments and nested conditionals. We prove termination of our algorithm. The p...
Laura Kovács
ICDT
2009
ACM
149views Database» more  ICDT 2009»
14 years 8 months ago
Query languages for data exchange: beyond unions of conjunctive queries
The class of unions of conjunctive queries (UCQ) has been shown to be particularly well-behaved for data exchange; its certain answers can be computed in polynomial time (in terms...
Juan Reutter, Marcelo Arenas, Pablo Barceló
FCT
2009
Springer
14 years 2 months ago
Equivalence of Deterministic Nested Word to Word Transducers
We study the equivalence problem of deterministic nested word to word transducers and show it to be suprisingly robust. Modulo polynomal time reductions, it can be identified with...
Slawomir Staworko, Grégoire Laurence, Aur&e...
ICFP
2003
ACM
14 years 7 months ago
Representing reductions of NP-complete problems in logical frameworks: a case study
Under the widely believed conjecture P=NP, NP-complete problems cannot be solved exactly using efficient polynomial time algorithms. Furthermore, any instance of a NP-complete pro...
Carsten Schürmann, Jatin Shah