# Approximate Envy-Freeness in Graphical Cake Cutting

arXiv: https://arxiv.org/abs/2304.11659 · HTML: https://mlsanity.com/paper/2304.11659/

## Key facts

- Cited by 1 papers in the map (data through 14 Oct 2026).
- First posted on arXiv 23 Apr 2023.

## Built on by (most cited first, 1 of 1)

- [The Complexity of Envy-Free Graph Cutting](https://mlsanity.com/paper/2312.07043/) (2023)

## Abstract (arXiv)

We study the problem of fairly allocating a divisible resource in the form of a graph, also known as graphical cake cutting. Unlike for the canonical interval cake, a connected envy-free allocation is not guaranteed to exist for a graphical cake. We focus on the existence and computation of connected allocations with low envy. For general graphs, we show that there is always a 1/2-additive-envy-free allocation and, if the agents' valuations are identical, a (2+ε)-multiplicative-envy-free allocation for any ε > 0. In the case of star graphs, we obtain a multiplicative factor of 3+ε for arbitrary valuations and 2 for identical valuations. We also derive guarantees when each agent can receive more than one connected piece. All of our results come with efficient algorithms for computing the respective allocations.