The conditional interpretation of general categorical statements like ‘All men are animals’ as universally quantified material conditionals ‘For all x, if x is F, then x is G’ suggests that the logical structure of law statements is conditional rather than categorical. Disregarding the problem that the universally quantified material conditional is trivially true whenever there are no xs that are F, there are some reasons to be sceptical of Frege’s equivalence between categorical and conditional expressions. -/- Now many philosophers will (...) claim that the material conditional interpretation of laws statements, dispositions ascriptions, or any causal claim is generally accepted as wrong and outdated. Still, there seem to be some basic logical assumptions that are shared by most of the participants in the debate on causal matters which at least stems from the traditional truth functional interpretation of conditionals. This is indicated by the vocabulary in the philosophical debate on causation, where one often speaks of ‘counterfactuals’, ‘possible worlds’ and ‘necessity’ without being explicit on whether or to what extent one accepts the logical-technical definition of these notions. To guarantee a non-Humean and non-extensional approach to causal relations, it is therefore important to be aware of the logical and metaphysical implications of the technical vocabulary. -/- In this paper we want to show why extensional logic cannot deal with causal relations. Via a logical analysis of law-like statements ‘All Fs are Gs’ we hope to throw some new light on interrelated notions like causation, laws, induction, hypotheticality and modality. If successful, our analysis should be of relevance for a deeper understanding of any type of causal relations, whether we understand them to be laws, dispositions, singulars or categoricals. (shrink)

Hva er vitenskap og hva anser vi som vitenskaplighet? Dette er spørsmål som kan være verdt å se nøyere på før vi aksepterer at det er et klart skille mellom den etablerte skolemedisinen og alt det vi kaller ”alternativ medisin” eller ”alternativ behandling”. For hva er det egentlig som gjør noe til etablert og noe annet til et alternativ? Er den etablerte medisin mer vitenskapelig enn den alternative, ved at den for eksempel benytter seg av mer vitenskapelige metoder? Er resultatene (...) til den etablerte behandlingen ”vitenskapelig bevist”, mens den alternative behandlingen ikke har noen vitenskapelig dokumenterte resultater å vise til? Og har den alternative tradisjonen et forklaringsproblem med hensyn til hvorfor behandlingen eventuelt fungerer, mens den etablerte tradisjonen kan henvise til entydige kausale modeller? -/- Hva vi er tilbøyelig til å svare på slike spørsmål avhenger av hva vi legger i begrepene vitenskap og vitenskapelighet. (shrink)

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In the years following its publication, F.A. Hayek's pioneering work on business cycles was regarded as an important challenge to what was later known as Keynesian macroeconomics. Today, economists are once again paying heed to Hayek's thoughts. This volume bring together his work on what causes periods of boom and bust in the economy.

Some philosopheis (e.g. Ayer, Reichenbach, Lewis) use a version of the argument from illusion to prove that empirical statements are never certain. But this argument, unwittingly, also calls into doubt the certainty of calculations in logic and mathematics. The argument seems to call into question the application of any rule on the grounds that one might at some future time find out that one had misapplied it. But the argument from illusion is only the illusion of an argument.

Hayek's substantial contribution to theoretical psychology has been addressed in the work of Thomas Szasz, Gerald Edelman, and Joaquin Fuster.