This paper is about the efforts the norwegian psychologist Jan Smedslund made in analyzing and checking philosophically his theory called ‘Psycho-logic’. I am going to reconstruct and discuss the debates between Smedslund and several critics, which have been going on since about 1978, mainly in the “Scandinavian Journal of Psychology”. A result will be that the kind of modal logics Smedslund uses — a type with realistic semantics and epistemology — is not the proper one for the analysis of ‘Psycho-logic’.

Common Sense and Logic in Jan Smedslund's 'Psycho-logic'. This paper is about the efforts the norwegian psychologist Jan Smedslund made in analyzing and checking philosophically his theory called 'Psycho-logic'. I am going to reconstruct and discuss the debates between Smedslund and several critics, which have been going on since about 1978, mainly in the "Scandinavian Journal of Psychology". A result will be that the kind of modal logics Smedslund uses - a type with realistic semantics and epistemology - is not (...) the proper one for the analysis of 'Psycho-logic'. (shrink)

Nietzsche’s favourable comments about science and the senses have recently been taken as evidence of naturalism. Others focus on his falsification thesis: our beliefs are falsifying interpretations of reality. Clark argues that Nietzsche eventually rejects this thesis. This article utilizes the multiple ways of being science friendly in Nietzsche’s context by focussing on Mach’s neutral monism. Mach’s positivism is a natural development of neo-Kantian positions Nietzsche was reacting to. Section 15 of Beyond Good and Evil is crucial to Clark’s interpretation. (...) The presented interpretation makes better sense of this passage and shows that Nietzsche can accept both falsification and empiricism. (shrink)

The work has two parts. The first part is about Peirce and his ideas about the continuum. There are considered the connection of his theory of continuity with his loic and his philosophy. In the second part Peirce's ideas are compared with models of todays logic and mathematics. There is considerd constructive mathematics, the logic of perception from Bell, Blau's Logic of reflection and a model of Myrvold. Then there is developed a new model.