### A note on lower bounds for boxicity of graphs

#### Abstract

The *boxicity* of a graph *G* is the minimum non-negative integer *k* such that *G* is isomorphic to the intersection graph of a family of boxes in Euclidean *k*-space, where a *box* in Euclidean *k*-space is the Cartesian product of *k* closed intervals on the real line. In this short note, we define the *fractional boxicity* of a graph as the optimum value of the linear relaxation of a covering problem with respect to boxicity, which gives a lower bound for its boxicity. We show that the fractional boxicity of a graph is at least the lower bounds for boxicity given by Adiga et al. in 2014. We also present a natural lower bound for fractional boxicity of graphs. The aim of this note is to discuss and focus on “accuracy” rather than “simplicity” of these lower bounds for boxicity as the next step in the work by Adiga et al.

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PDFDOI: http://dx.doi.org/10.5614/ejgta.2024.12.1.12

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