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Towards the sampling Lovász Local Lemma
Vishesh Jain, Huy Tuan Pham, Thuy Duong Vuong · 2020-11-25 · via math.PR updates on arXiv.org

Let $Φ= (V, \mathcal{C})$ be a constraint satisfaction problem on variables $v_1,\dots, v_n$ such that each constraint depends on at most $k$ variables and such that each variable assumes values in an alphabet of size at most $[q]$. Suppose that each constraint shares variables with at most $Δ$ constraints and that each constraint is violated with probability at most $p$ (under the product measure on its variables). We show that for $k, q = O(1)$, there is a deterministic, polynomial time algorithm to approximately count the number of satisfying assignments and a randomized, polynomial time algorithm to sample from approximately the uniform distribution on satisfying assignments, provided that \[C\cdot q^{3}\cdot k \cdot p \cdot Δ^{7} < 1, \quad \text{where }C \text{ is an absolute constant.}\] Previously, a result of this form was known essentially only in the special case when each constraint is violated by exactly one assignment to its variables. For the special case of $k$-CNF formulas, the term $Δ^{7}$ improves the previously best known $Δ^{60}$ for deterministic algorithms [Moitra, J.ACM, 2019] and $Δ^{13}$ for randomized algorithms [Feng et al., arXiv, 2020]. For the special case of properly $q$-coloring $k$-uniform hypergraphs, the term $Δ^{7}$ improves the previously best known $Δ^{14}$ for deterministic algorithms [Guo et al., SICOMP, 2019] and $Δ^{9}$ for randomized algorithms [Feng et al., arXiv, 2020].