About
I am an associate professor and member of
the Programming, Logic and Intelligent
Systems research group in
the Department
of People and Technology at Roskilde
University, Denmark.
My research is in Knowledge Representation and Reasoning, a subarea
of Artificial Intelligence that studies how an agent's knowledge can
be represented symbolically and subsequently manipulated through
reasoning algorithms. Among other things, my work is concerned with
reasoning about action and change, reasoning about beliefs,
planning, agent program verification, synthesis, and machine ethics.
The ß in
my last name is a German letter that is roughly pronounced like
"ss" (as in pass), and not to be confused with a "b" or the
Greek letter beta
(β). An
alternative spelling is "Classen".
Latest News
2025-09-23
Later this week I will attend TABLEAUX 2025 in Reykjavik, Iceland. I am presenting a paper co-authored with Torben Braüner on a tableau system for first-order logic with standard names.
2025-06-06
I am excited to announce that I received a positive tenure evaluation, and have now been appointed as an associate professor. I am deeply grateful for being given this opportunity, and look forward to this next chapter.
2025-02-18
I am co-author of two papers to be presented at AAAI 2025 next week. Daxin Liu will present our paper on iteratable first-order progression, and Till Hofmann our paper on LTLf synthesis on first-order agent programs.
[all news]
Recent Publications
Jens Claßen and Torben Braüner:
A Tableau System for First-Order Logic with Standard Names.
Proceedings of the 34th International Conference on Automatic Reasoning with Analytic Tableaux and Related Methods (TABLEAUX 2025), pages 22-38, Springer, 2025.
PDFBibTeXDOI
Sarah Alminde, Asta Breinholt, Jens Classen, Line Jespersgaard Jakobsen, and Simon Herzog:
Student Engagement: Potentials of the Flipped Classroom Approach.
Dansk Universitetspædagogisk Tidsskrift, Volume 20, Number 38, pages 138-153, 2025.
PDFBibTeXDOI
Till Hofmann and Jens Claßen:
LTLf Synthesis on First-Order Agent Programs in Nondeterministic Environments.
Proceedings of the 39th AAAI Conference on Artificial Intelligence (AAAI 2025), pages 14976-14986, AAAI Press, 2025.
PDFBibTeXDOICode
[all publications]