Edmund Husserl: Perbedaan antara revisi

It has been suggested by some analytic philosophers that Edmund Husserl after obtaining his PhD in mathematics, began analysing the foundations of mathematics from a rather psychological point of view, as Brentano's disciple. In his professorship doctoral dissertation called "On the Concept of Number" (1886) and his ''Philosophy of Arithmetic'' (1891) Husserl enhanced the approach taken by Weierstrass and other mathematicians of the time in defining the natural numbers by counting with Brentano's methods of descriptive psychology. Later, when attacking the psychologistic point of view of logic and mathematics in the first volume of his ''Logical Investigations'' called "The Prolegomena of Pure Logic", he appears to reject much of his early work, though the forms of psychologism analysed and refuted in the ''Prolegomena'' do not apply directly to his ''Philosophy of Arithmetic''. While some scholars point to [[Gottlob Frege]]'s negative review of the ''Philosophy of Arithmetic'', this did not turn Husserl towards Platonism, as he had already discovered the work of [[Bernhard Bolzano]] around 1890/91 and explicitly mentions Bolzano, Leibniz and Lotze as inspirations for his newer position.

Furthermore, from various sources it is quite clear that Husserl changed his mind about psychologism as early as 1890, a year before his ''Philosophy of Arithmetic'' was published. Husserl stated that when it was published, he had already changed his mind. In fact, he says that he had doubts about psychologism from the very beginning. He attributed his change of mind to [[Gottfried Wilhelm von Leibniz]], [[Bernard Bolzano]], [[Rudolf Hermann Lotze]], and [[David Hume]].<ref>''Husserl-Chronik'', p. 25-26</ref> He makes no mention of Frege as being decisive for the change. In his ''Logical Investigations'', Husserl mentions Frege only twice, one of them in a footnote to point out that he retracted three pages of his criticim of Frege's ''The Foundations of Arithmetic'', and the other one was to question Frege's use of the word ''Bedeutung'' to designate reference rather than meaning (sense).

[[Hermann Weyl]]'s interest in [[intuitionistic logic]] and [[impredicativity]] appears to have resulted from contacts with Husserl.

[[Rudolf Carnap]] was also influenced by Husserl, not only concerning Husserl's notion of essential insight that Carnap used in his ''Der Raum'', but also his notion of "formation rules" and "transformation rules" is founded on Husserl's philosophy of logic.