Abstract

This book is an attempt to present a coherent and relevant reconstruction, expansion and revision of Karl Popper's Three-World-Theory (abbreviated to 3Wt). This theory is part of Popper's (rare) metaphysical work; he developed it in the sixties and he referred to it in a number of his later publications. Most commentaries on this 3Wt were very critical and in fact rejected the theory as such, but I argue that this judgement has been too premature and that a 3Wt, when adjusted and expanded, is a potentially useful and relevant theory for philosophy and the sciences. The theory states that there are three worlds, which are called by Popper World 1, World 2 and World 3 (my abbreviation: W1, W2 and W3). Each of the three worlds contains specific 'entities'. ... Zie: Summary