ABSTRACT
Gottlob Friedrich Ludwig Frege was born on 8 November 1848 at Wismar Mecklenburg, Germany and died on 26 July 1925 at Bad Kleinen. Today it is usually undisputed that Frege was the real founder of modern logic, i.e. he is considered to be the most important logician since Aristotle. Summing up Frege's contribution to logic retrospectively speaking, i.e. from a modern point of view and with the knowledge of modern developments, one could say that Frege in his BS for the first time produced a logical system with formalized language, axioms and rules for inference. In GGA, Frege's main oeuvre, which is explicitly concerned with his so-called logicist program of ‘reducing’ arithmetic to logic, Frege once more formulates his logic. Presupposing Frege's functional interpretation or rather reconstruction of the idea of a concept, a number is attached to a concept in the sense that the objects which need to be counted fall under that concept.
