Paul Bernays' philosophical way

Though E.W. Beth is famous for his contributions to logic, aspects of his philosophical reflections and details of its development are most unknown. This article presents them, after distinguishing four periods in his work: the neo-kantian, the anti-kantian, the anti-irrationalist and the logical one. Within this framework it is possible to induviduate a core around which Beth developed his thoughts: it is the interplay between philosophy and the sciences. His philosophy was always linked to the sciences in two ways: he steadily checked his philosophical ideas against the current situation in foundational research and he occupied himself with the general question of the relationship between philosophy and the sciences.