•  399
    Forms and Norms of Indecision in Argumentation Theory
    Deontic Logic and Normative Systems, 15th International Conference, DEON 2020/2021. 2021.
    One main goal of argumentation theory is to evaluate arguments and to determine whether they should be accepted or rejected. When there is no clear answer, a third option, being undecided, has to be taken into account. Indecision is often not considered explicitly, but rather taken to be a collection of all unclear or troubling cases. However, current philosophy makes a strong point for taking indecision itself to be a proper object of consideration. This paper aims at revealing parallels betwee…Read more
  •  170
    On Floating Conclusions
    with Jan Broersen and Henry Prakken
    Deontic Logic and Normative Systems, 16Th International Conference, Deon 2023. 2023.
    When there are two lines of argument that contradict each other but still end up with the same conclusion, this conclusion is called a floating conclusion. It is an open topic in skeptical defeasible reasoning if floating conclusions ought to be accepted. Inter- estingly, the answer seems to be changing for different examples. In this paper, we propose a solution for explaining the different treatments of the floating conclusion in the various examples from the literature. We collect the example…Read more
  •  68
    On the pure logic of justified belief
    with Leon Horsten
    Synthese 200 (5): 1-21. 2022.
    Justified belief is a core concept in epistemology and there has been an increasing interest in its logic over the last years. While many logical investigations consider justified belief as an operator, in this paper, we propose a logic for justified belief in which the relevant notion is treated as a predicate instead. Although this gives rise to the possibility of liar-like paradoxes, a predicate treatment allows for a rich and highly expressive framework, which lives up to the universal ambit…Read more
  •  30
    The fixed points of belief and knowledge
    Logic Journal of the IGPL. forthcoming.
    Self-referential sentences have troubled our understanding of language for centuries. The most famous self-referential sentence is probably the Liar, a sentence that says of itself that it is false. The Liar Paradox has encouraged many philosophers to establish theories of truth that manage to give a proper account of the truth predicate in a formal language. Kripke’s Fixed Point Theory from 1975 is one famous example of such a formal theory of truth that aims at giving a plausible notion of tru…Read more