Rare, shortened and partially corrected version of Fuhrmann's doctoral thesis submitted to the Australian National University in September 1988. (vi), 194 pages. No marks in text. Bound in original yellow paper printed covers, slightly sunned on upper cover. Spine blank, as issued. Fuhrmann holds the Professorship for Theoretical Philosophy with a focus on logic at the Johann Wolfgang Goethe University in Frankfurt am Main, and was Heinz Maier-Leibnitz Prize-winner in 1993.