Project description
Connecting finite and infinite structures in complexity theory
Infinite structures, such as Borel and measurable graphs, are essential in mathematics and computer science because they help model and analyse complex systems that go beyond finite limitations, such as infinite networks or processes. However, their behaviour often differs significantly from finite structures, hindering understanding of their properties and applications. The ERC-funded DEFINE project will investigate these differences. The research will focus on three key areas: determining the complexity of solving constraint satisfaction problems (CSPs) on infinite domains, analysing the concept of Borel hyperfiniteness in graphs and identifying exceptions, and adapting ideas from set theory to distributed computing models. The goal is to deepen understanding of complexity hierarchies arising from CSPs, advance descriptive combinatorics, and build connections between finite and infinite systems.
Objective
We propose to study infinite, definable (Borel, measurable, etc.) graphs and structures and their interplay with finite ones from the perspective of descriptive complexity. Our focus will be on the following three directions:
-Determining the descriptive complexity of constraint satisfaction problems (CSPs), or, equivalently, homomorphism problems on infinite domains.
-Analyzing the concept of Borel hyperfiniteness of graphs and establishing new examples of non-hyperfinite graphs using methods from infinite-dimensional Ramsey theory.
-Developing finitary analogues of the Borel hierarchy from descriptive set theory, constructing generalizations of the LOCAL model of distributed computing, and transferring theorems from descriptive set theory to this context.
Through this research, we will achieve a deeper understanding of complexity hierarchies arising from CSPs, further advance the field of descriptive combinatorics, and transfer techniques between the finite and infinite worlds.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
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Keywords
Project’s keywords as indicated by the project coordinator. Not to be confused with the EuroSciVoc taxonomy (Fields of science)
Project’s keywords as indicated by the project coordinator. Not to be confused with the EuroSciVoc taxonomy (Fields of science)
Programme(s)
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
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HORIZON.1.1 - European Research Council (ERC)
MAIN PROGRAMME
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Topic(s)
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Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Funding Scheme
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Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
HORIZON-ERC - HORIZON ERC Grants
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Call for proposal
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Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
(opens in new window) ERC-2025-COG
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Net EU financial contribution. The sum of money that the participant receives, deducted by the EU contribution to its linked third party. It considers the distribution of the EU financial contribution between direct beneficiaries of the project and other types of participants, like third-party participants.
1053 BUDAPEST
Hungary
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