Why would a respected historian of ancient philosophy, formerly a professor at Yale and now at All Souls, resort to claiming that Frege had “plagiarized” the Stoics? When you look at the paper more closely, you realize a number of things: (1) We’re not talking about Frege the inventor of modern predicate logic (the author of the Begriffsschrift and Grundgesetze), nor even about Frege the philosopher of logic, logicism, and arithmetic (the author of The Foundations of Arithmetic); we’re talking only about Frege the supposed “philosopher of language,” the later Frege who wrote “On Sense and Reference” and related papers. (2) Even in the case of this Frege, a case is made only that he was influenced by the Stoics, not that he “plagiarized” them (as the author herself recognizes perfectly well, e.g. on pp. 202-4). (3) Most of her case rests on evidence of Frege’s borrowing from the Stoics that had previously been documented in some detail in a 2009 HPL paper by Gabriel, Hülser, and Schlotter, which she dismissively makes fun of in the beginning of her paper and claims to have refuted. (4) Her supposed refutation of that paper concerns none of the details of the Stoics’ influence on Frege, but consists merely in showing — ostensibly — that Frege’s use of Stoic motifs derives not from Frege’s friendship with the scholar of ancient Stoicism Rudolf Hirzel (Frege’s tenant of an apartment in his house in Jena), but from Frege’s own reading of Prantl’s history of logic. Her case here remains (as she admits) circumstantial and far from clear-cut.

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