Equitable Colorings of Vertex-Weighted Graphs
Provides theoretical guarantees for fairness in graph coloring with vertex weights, relevant to fair division and concentration inequalities.
The paper studies equitable colorings in vertex-weighted graphs, proving that for any graph with maximum degree Δ, there exist (1+ε)-EQ1 k-colorings for sufficiently large k, and 2-EQ1 k-colorings for k ≥ Δ+1, both computable in polynomial time.
We study a generalization of the classical Hajnal-Szemerédi theorem to vertex-weighted graphs. Given a graph with nonnegative vertex weights, a coloring is called $α$-approximately equitable up to one vertex ($α$-EQ1) if, for each color class, the total weight remaining after removing its maximum-weight vertex is at most $α\geq 1$ times the weight of any other color class. For vertex-weighted graphs with maximum degree $Δ$, we show that there exist instances for which no $k$-coloring is $α$-EQ1 for any $k < \frac{3Δ}{2}$ and $α< \sqrt{2}$. In light of this impossibility, we relax these parameters and establish the following results for any vertex-weighted graph $G$ with maximum degree $Δ$: (1) for any $\varepsilon \in (0,1)$ and all $k \geq (\frac{c}{\varepsilon^2}\ln{\frac{1}{\varepsilon}}) Δ$, there exists a $(1 + \varepsilon)$-EQ1 $k$-coloring of $G$, where $c$ is a fixed constant; and (2) for all $k \ge Δ+ 1$, there exists a $2$-EQ1 $k$-coloring of $G$. Furthermore, such equitable colorings can be computed in polynomial time. En route to our results on equitability under vertex weights, we establish sufficient conditions for the existence of $k$-colorings that are equitable with respect to any given partition of the vertex set. Our coloring results correspond to fairness guarantees in a constrained fair division setting and lead to concentration inequalities for partly dependent random variables.