(1) Department of Philosophy, University of California – Berkeley, 314 Moses Hall, Berkeley, CA 94720-2390, USA
Abstract:
Work on how to axiomatize the subtheories of a first-order theory in which only a proper subset of their extra-logical vocabulary is being used led to a theorem on recursive axiomatizability and to an interpolation theorem for first-order logic. There were some fortuitous events and several logicians played a helpful role.