Lotze and frege: The dating of the'Kernsätze'∗

History and Philosophy of Logic 18 (1):17-31 (1997)
Abstract
Michael Dummett has shown that the fragment ?17 Kernsätze zur Logik? is evidence that Frege knew Lotze's Logik Dummett?s dating of this fragment prior to 1879, however, must be rejected.The present paper shows that there are other articles of Frege?s which bear clear traces of Lotze's LogikFirst of all, the expressions Vorstellungsverlauf from ?Über die wissenschaftliche Berechtigung einer Begriffsschrift?, and veranlassenden Ursachen, from ?Logik?, certainly are borrowed from Lotze.Second, there are links between ?Booles rechnende Logik und die Begriffsschrift? and Lotze's Logik. Furthermore, it is shown that Frege?s ?Kernsätze?, the ?Dialog mit Pünjer über Existenz?, and his ?Logik? are intimately connected.All of this indicates that these texts were written in roughly the same period, namely the early 1880s.Conclusive evidence for this is that the terms Vorstellung and Vorstellungsverbindung are used indiscriminately in both a psychological and a logical sense in the ?Begriffsschrift?, a fact which contradicts the ?Kernsätze?
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