English summary: This volume comprises four papers by logician and philosopher Dagfinn Follesdal, the art historian Horst Bredekamp, and the jurist Udo Di Fabio, introduced by the philosopher Wolfram Hogrebe. Follesdal shows analogies in Godel's and Husserl's views on mathematical Platonism. Both, he argues, converge in a Platonism open to revision. Futhermore Follesdal examines W. V. O. Quine's concept of behaviorism. He shows that Quine...