Logical Investigations (German: Logische Untersuchungen) is a work of philosophy by Edmund Husserl, published in two volumes in 1900 and 1901, with a second edition in 1913 and 1921. In Logical Investigations, which resulted from a shift in Husserl's interests from mathematics to logic and epistemology, Husserl maintains that mathematical laws are not empirical laws that describe the workings of the mind, but ideal laws whose necessity is intuited a priori. Though Husserl abandoned psychologism, the doctrine according to which logical entities such as propositions, universals, and numbers can be reduced to mental states or activities, in Logical Investigations, some commentators have seen a revival of psychologism in its second volume. Logical Investigations helped to create phenomenology, and has been credited with making twentieth century continental philosophy possible. Martin Heidegger was among the philosophers influenced by the work. An English translation of the second edition, by the philosopher J. N. Findlay, was published in 1970.
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