•  33
    Learning from History
    Theoria 67 (1): 1-3. 2001.
  •  10
    Index of Swedish Theses in Philosophy 2007–2016
    Theoria 83 (3): 273-293. 2017.
  •  43
    Iterated Descriptor Revision and the Logic of Ramsey Test Conditionals
    Journal of Philosophical Logic 45 (4): 429-450. 2016.
    Two of the major problems in AGM-style belief revision, namely the difficulties in accounting for iterated change and for Ramsey test conditionals, have satisfactory solutions in descriptor revision. In descriptor revision, the input is a metalinguistic sentence specifying the success condition of the operation. The choice mechanism selects one of the potential outcomes in which the success condition is satisfied. Iteration of this operation is unproblematic. Ramsey test conditionals can be intr…Read more
  •  48
    Formal Philosophy – A Guarded Defence
    Theoria 79 (4): 287-289. 2013.
  •  4
    Levi's ideals
    In Erik J. Olsson (ed.), Knowledge and Inquiry: Essays on the Pragmatism of Isaac Levi, Cambridge University Press. 2006.
  •  71
    Local change
    with Renata Wassermann
    Studia Logica 70 (1). 2002.
    An agent can usually hold a very large number of beliefs. However, only a small part of these beliefs is used at a time. Efficient operations for belief change should affect the beliefs of the agent locally, that is, the changes should be performed only in the relevant part of the belief state. In this paper we define a local consequence operator that only considers the relevant part of a belief base. This operator is used to define local versions of the operations for belief change. Representat…Read more
  •  49
  •  730
    Den moralfilosofiska traditionen har sina begränsningar. De frågor som stått i centrum för den moralfilosofiska diskussionen har ofta varit helt andra än de som människor i det praktiska livet har uppfattat som centrala moraliska problem. En viktig begränsning är att moralfilosofin, liksom beslutsteorin, nästan uteslutande har handlat om hur man hanterar välavgränsade problem där handlingsalternativen är givna. I det verkliga livet löser vi ofta moraliska problem genom att finna på nya handlings…Read more
  •  68
    Is Philosophy Just a Set of Empty Ideas?
    Theoria 81 (1): 1-3. 2015.
  • Isaac Levi: The Fixation of belief and its undoing (review)
    Theoria 58 (1): 87. 1992.
  •  3
    Is Anthroposophy Science?
    Conceptus: Zeitschrift Fur Philosophie 25 (64): 1991. 1991.
  •  53
    Multiple contraction (simultaneous contraction by several sentences) and iterated contraction are investigated in the framework of specified meet contraction (s.m.c.) that is extended for this purpose. Multiple contraction is axiomatized, and so is finitely multiple contraction (contraction by a finite set of sentences). Two ways to reduce finitely multiple contraction to contraction by single sentences are introduced. The reduced operations are axiomatically characterized and their properties a…Read more
  •  17
    Is Philosophy Losing Ground?
    Theoria 66 (1): 1-2. 2000.
  •  49
    Ideal Worlds — Wishful Thinking in Deontic Logic
    Studia Logica 82 (3): 329-336. 2006.
    The ideal world semantics of standard deontic logic identifies our obligations with how we would act in an ideal world. However, to act as if one lived in an ideal world is bad moral advice, associated with wishful thinking rather than well-considered moral deliberation. Ideal world semantics gives rise to implausible logical principles, and the metaphysical arguments that have been put forward in its favour turn out to be based on a too limited view of truth-functional representation. It is arg…Read more
  •  60
    In defense of base contraction
    Synthese 91 (3). 1992.
    In the most common approaches to belief dynamics, states of belief are represented by sets that are closed under logical consequence. In an alternative approach, they are represented by non-closed belief bases. This representation has attractive properties not shared by closed representations. Most importantly, it can account for repeated belief changes that have not yet been satisfactorily accounted for in the closed approach.
  •  468
    Inom hakparentes anges den ordagranna betydelsen, när denna skiljer sig mycket från frasens gängse filosofiska innebörd. På tre- och fler-staviga ord har har ett accenttecken satts in före den betonade vokalen. (Tvåstaviga latinska ord har alltid betoningen på första stavelsen.).
  •  129
    Kernel contraction
    Journal of Symbolic Logic 59 (3): 845-859. 1994.
    Kernel contraction is a natural nonrelational generalization of safe contraction. All partial meet contractions are kernel contractions, but the converse relationship does not hold. Kernel contraction is axiomatically characterized. It is shown to be better suited than partial meet contraction for formal treatments of iterated belief change
  •  25
    In praise of full meet contraction
    Análisis Filosófico 26 (1): 134-146. 2006.
    Full meet contraction, that was devised by Carlos Alchourrón and David Makinson in the early 1980' s, has often been overlooked since it is not in itself a plausible contraction operator. However, it is a highly useful building-block in the construction of composite contraction operators. In particular, all plausible contraction operators can be reconstructed so that the outcome of contracting a belief set K by a sentence p is defined as K ∼ f, where ∼ is full meet contraction and f a sentential…Read more
  •  90
    Individuals and collective actions
    Theoria 52 (1-2): 87-97. 1986.
  •  48
    Maximal and perimaximal contraction
    Synthese 190 (16): 3325-3348. 2013.
    Generalizations of partial meet contraction are introduced that start out from the observation that only some of the logically closed subsets of the original belief set are at all viable as contraction outcomes. Belief contraction should proceed by selection among these viable options. Several contraction operators that are based on such selection mechanisms are introduced and then axiomatically characterized. These constructions are more general than the belief base approach. It is shown that p…Read more
  •  25
    Local Change
    with Renata Wassermann
    Studia Logica 70 (1): 49-76. 2002.
    An agent can usually hold a very large number of beliefs. However, only a small part of these beliefs is used at a time. Efficient operations for belief change should affect the beliefs of the agent locally, that is, the changes should be performed only in the relevant part of the belief state. In this paper we define a local consequence operator that only considers the relevant part of a belief base. This operator is used to define local versions of the operations for belief change. Representat…Read more
  •  726
    Förord ................................................................................................................... 4 1 Vilken kunskap vill vi ha?................................................................................ 6..
  •  1
    Essentially inconsistent concepts
    Conceptus: Zeitschrift Fur Philosophie 33 (82): 57-66. 2000.
  •  23
    Editorial: A Dialogue on Definitions
    Theoria. forthcoming.
  •  583
    discussions of risk contain logical and argumentative fallacies that are specific to the subject-matter. Ten such fallacies are identified, that can commonly be found in public debates on risk. They are named as follows: the sheer size fallacy, the converse sheer size fallacy, the fallacy of naturalness, the ostrich's fallacy, the proof-seeking fallacy, the delay fallacy, the technocratic fallacy, the consensus fallacy, the fallacy of pricing, and the infallability fallacy.
  •  32