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Department of Software Science

  • Anthropic officially announced that one of their internal models, using the prove2.me platform, has formalized a complete proof of Fermat’s Last Theorem (FLT) in Lean. This is the final theorem to be formalized in Freek Wiedijk’s famous list of 100 formalization challenges and thus wraps up this 20-year-old benchmark. See also Kevin Buzzard's post.
  • The ICFP 2016 paper Higher-Order Ghost State, authored by Ralf Jung, Robbert Krebbers (SWS), Derek Dreyer, and Lars Birkedal, received the 2026 ACM SIGPLAN Most Influential ICFP Paper Award
  • The ACM SIGPLAN International Conference on Functional Programming (ICFP) 2027 will take place in Nijmegen, from Sunday 26 September until Friday 1 October, 2027. Robbert Krebbers serves as general chair.
  • Tom de Jong received a Veni grant and will join the SWS group. Welcome Tom!
  • More news..
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Software has shaped every aspect of our modern lives. Providing programmers with tools that elevate their productivity, simplify code maintenance, and ensure that software is correct, efficient, dependable and sustainable, is both a major scientific challenge and an enterprise with enormous societal relevance. Our mission is to conduct world-leading research on the use of high-level specifications and models for design and analysis of software, bridging the gap between theory and applications.

We have expertise covering a broad range of topics concerning analysis of computer-based systems, mathematical foundations, and software construction, increasingly involving the use of AI. We collaborate with stakeholders from industry and other application areas, trying to understand how our research can contribute to solving real-world problems. Our group is partner of ESI, participates in the Dutch Institute for Programming research and Algorithmics (IPA), the Dutch National Education Lab AI (NOLAI) and the European Lab for Learning and Intelligent Systems (ELLIS), and supports the Dutch National Association for Software Engineering (VERSEN). TOP Software Technology is a spin-off company founded by members of our group.