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Vasilis Gkatzelis

9 accepted papers

2025

Optimal Metric Distortion for Matching on the Line

IJCAI 2025

We study the distortion of one-sided and two-sided matching problems on the line. In the one-sided case, n agents need to be matched to n items, and each agent's cost in a matching is their distance from the item they were matched to. We propose an algorithm that is provided only with ordinal inform

Cited by 0SourcePDFScholar
2025

Procurement Auctions with Predictions: Improved Frugality for Facility Location

NeurIPS 2025poster

We study the problem of designing procurement auctions for the strategic uncapacitated facility location problem: a company needs to procure a set of facility locations in order to serve its customers and each facility location is owned by a strategic agent. Each owner has a private cost for providi…

Cited by 0SourceScholar
2024

Getting More by Knowing Less: Bayesian Incentive Compatible Mechanisms for Fair Division

IJCAI 2024poster

We study fair resource allocation with strategic agents. It is well-known that, across multiple fundamental problems in this domain, truthfulness and fairness are incompatible. For example, when allocating indivisible goods, no truthful and deterministic mechanism can guarantee envy-freeness up to o…

Cited by 3SourcePDFScholar
2023

Proportionally Fair Online Allocation of Public Goods with Predictions

IJCAI 2023poster

We design online algorithms for fair allocation of public goods to a set of N agents over a sequence of T rounds and focus on improving their performance using predictions. In the basic model, a public good arrives in each round, and every agent reveals their value for it upon arrival. The algorithm…

Cited by 24SourcePDFScholar
2021

Achieving Proportionality up to the Maximin Item with Indivisible Goods

AAAI 2021technical

We study the problem of fairly allocating indivisible goods and focus on the classic fairness notion of proportionality. The indivisibility of the goods is long known to pose highly non-trivial obstacles to achieving fairness, and a very vibrant line of research has aimed to circumvent them using ap…

Cited by 16SourcePDFScholar
2021

Fair and Efficient Online Allocations with Normalized Valuations

AAAI 2021technical

A set of divisible resources becomes available over a sequence of rounds and needs to be allocated immediately and irrevocably. Our goal is to distribute these resources to maximize fairness and efficiency. Achieving any non-trivial guarantees in an adversarial setting is impossible. However, we sho…

Cited by 25SourcePDFScholar
2021

PROPm Allocations of Indivisible Goods to Multiple Agents

IJCAI 2021poster

We study the classic problem of fairly allocating a set of indivisible goods among a group of agents, and focus on the notion of approximate proportionality known as PROPm. Prior work showed that there exists an allocation that satisfies this notion of fairness for instances involving up to five age…

Cited by 16SourcePDFScholar