Paper based on A two-level approach to logics of data and information
Published in Synthese 167(2) (2009): 231-249.
(Knowledge, Rationality, and Action) special issue on the Philosophy of Information and Logic edited by Luciano Floridi and Sebastian Sequoiah-Grayson (Online First).
Abstract. Cognitive states as well as cognitive commodities play central though distinct roles in our epistemological theories. By being attentive to how a difference in their roles affects our way of referring to them, we can undoubtedly accrue our understanding of the structure and functioning of our main epistemological theories. In this paper we propose an analysis of the dichotomy between states and commodities in terms of the method of abstraction, and more specifically by means of infomorphisms between different ways to classify states of information, information-bases, and evidential situations.
