Local Approximability of Minimum Dominating Set on Planar Graphs

We show that there is no deterministic local algorithm (constant-time distributed graph algorithm) that finds a $(7-ε)$-approximation of a minimum dominating set on planar graphs, for any positive constant $ε$. In prior work, the best lower bound on the approximation ratio has been $5-ε$; there is also an upper bound of $52$.

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