Friedrich Ludwig Gottlob Frege (/ˈfreɪɡə/;[10]German:[ˈɡɔtloːpˈfreːɡə]; 8 November 1848 – 26 July 1925) was a German philosopher, logician, and mathematician. He was a mathematics professor at the University of Jena, and is understood by many to be the father of analytic philosophy, concentrating on the philosophy of language, logic, and mathematics. Though he was largely ignored during his lifetime, Giuseppe Peano (1858–1932), Bertrand Russell (1872–1970), and, to some extent, Ludwig Wittgenstein (1889–1951) introduced his work to later generations of philosophers. Frege is widely considered to be the greatest logician since Aristotle, and one of the most profound philosophers of mathematics ever.[11]
^Balaguer, Mark (25 July 2016). Zalta, Edward N. (ed.). Platonism in Metaphysics. Metaphysics Research Lab, Stanford University – via Stanford Encyclopedia of Philosophy.
^Tom Rockmore, On Foundationalism: A Strategy for Metaphysical Realism, Rowman & Littlefield, 2004, p. 111.
^Frege criticized direct realism in his "Über Sinn und Bedeutung" (see Samuel Lebens, Bertrand Russell and the Nature of Propositions: A History and Defence of the Multiple Relation Theory of Judgement, Routledge, 2017, p. 34).
^Gottlob Frege, Grundgesetze der Arithmetik I, Jena: Verlag Hermann Pohle, 1893, §36.
^Willard Van Orman Quine, introduction to Moses Schönfinkel's "Bausteine der mathematischen Logik", pp. 355–357, esp. 355. Translated by Stefan Bauer-Mengelberg as "On the building blocks of mathematical logic" in Jean van Heijenoort (1967), A Source Book in Mathematical Logic, 1879–1931. Harvard University Press, pp. 355–66.