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APPROX
2009
Springer

Optimal Sherali-Adams Gaps from Pairwise Independence

10 years 8 months ago
Optimal Sherali-Adams Gaps from Pairwise Independence
Abstract. This work considers the problem of approximating fixed predicate constraint satisfaction problems (MAX k-CSP(P)). We show that if the set of assignments accepted by P contains the support of a balanced pairwise independent distribution over the domain of the inputs, then such a problem on n variables cannot be approximated better than the trivial (random) approximation, even using Ω(n) levels of the SheraliAdams LP hierarchy. It was recently shown [3] that under the Unique Game Conjecture, CSPs with predicates with this condition cannot be approximated better than the trivial approximation. Our results can be viewed as an unconditional analogue of this result in the restricted computational model defined by the Sherali-Adams hierarchy. We also introduce a new generalization of techniques to define consistent “local distributions” over partial assignments to variables in the problem, which is often the crux of proving lower bounds for such hierarchies.
Konstantinos Georgiou, Avner Magen, Madhur Tulsian
Added 25 May 2010
Updated 25 May 2010
Type Conference
Year 2009
Where APPROX
Authors Konstantinos Georgiou, Avner Magen, Madhur Tulsiani
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