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This paper is a review of Rudolf Carnap's changing attitudes to- wards the conceptualisation of pseudo-problems. For that purpose his early works (until 1935) are divided into four phases each of which display subtle differences with respect to the role pseudo-problems play in Carnap's epistemology and philosophical methodology. Based on a number of short texts by Carnap, an attempt is made to give provisional definitions of `pseudo-problem' and related expressions.

What concepts figure in our non-inferential beliefs: "electrons", "cardinals" or color-concepts? Neo-Pragmatists like Sellars, Bran-dom and McDowell took different routes to answer this question. All of these routes rely heavily on the concept of inference. This paper seeks to examine the plausibility of each route while taking a close look on the way "non-inferentiality" is conceived.

Sometimes the thesis has been put forth that the languages of 3- Dimensionalism and 4-Dimensionalism are completey translatable into each other without any loss of meaning. Prominently, this thesis has recently been defended by Jonathan Lowe and Storrs McCall. A global inter-translatability would show that there is no deeper systematic or even ontological difference between these philosophical positions despite that both are using a different vocabulary to describe the same features of reality. In this paper, I want to argue that the thesis of 3D-4D-Equivalence covers some interesting aspects of the discussion between 3-Dimensionalists and 4-Dimensionalists, but is not able to grasp fully the ontological intuitions of both positions. At the end of the day, it seems necessary to refute the thesis that 3-Dimensionalism and 4-Dimensionalism are eqivalent in the sense that both are completely translatable into each other.

According to the incentives argument, inequalities in material goods are justifiable if they are to the benefit of the worst off members of society. In this paper, I point out what is easily overlooked, namely that inequalities are justifiable only if they are to the overall benefit of the worst off, that is, in terms of both material and social goods. I then address the question how gains in material goods can be weighed against probable losses in social goods. The ultimate criterion, so my idea, is how these gains and losses affect a person's ability to reach her goals in life. Based on the idea that goals in life cannot be taken as given, I conclude that the absolute material gains are negligible compared to the losses of social goods and the disadvantage in the relative position caused by material inequalities.

A central problem of theories of grounded cognition concerns the grounding of abstract concepts in sensorimotor representations. The paper aims at providing a new basis for a theory of cogni-tive abstraction mechanisms. The focus will be on the notions of causal indexicals and affordances, understood as action related concepts that show different degrees of abstraction. Abstraction mechanisms will be characterized that allow the transformation of such obviously "grounded" concepts into more abstract ones. In this way, the relation between sensorimotor processes and abstract concepts will be described in detail, and general principles of abstraction will be determined.

We give an elementary introduction into the theory of consequence operations. We proof some elementary results concerning basic notions of logic like tautology, consistency, independence and completeness. We show in particular that every finite axiomatizable set is independent axiomatizable and that every consistent set has relative to a finitary consequence operation a maximal consistent extension. Finally we provide an abstract semantics for consequence operations