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• W1488045458 abstract "Cubicity of a graph $G$ is the smallest dimension $d$, for which $G$ is a unit disc graph in ${mathbb{R}}^d$, under the $l^infty$ metric, i.e. $G$ can be represented as an intersection graph of $d$-dimensional (axis-parallel) unit hypercubes. We call such an intersection representation a $d$-dimensional cube representation of $G$. Computing cubicity is known to be inapproximable in polynomial time, within an $O(n^{1-epsilon})$ factor for any $epsilon >0$, unless NP=ZPP. In this paper, we present a randomized algorithm that runs in polynomial time and computes cube representations of trees, of dimension within a constant factor of the optimum. It is also shown that the cubicity of trees can be approximated within a constant factor in deterministic polynomial time, if the cube representation is not required to be computed. As far as we know, this is the first constant factor approximation algorithm for computing the cubicity of trees. It is not yet clear whether computing the cubicity of trees is NP-hard or not." @default.
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• W1488045458 date "2014-02-25" @default.
• W1488045458 modified "2023-09-27" @default.
• W1488045458 title "Approximating the Cubicity of Trees." @default.
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