Logical Investigations () is a book by the philosopher Edmund Husserl. It is a foundational text in phenomenology.One Hundred Years of Phenomenology: Husserl’s Logical Investigations Revisited. (2013). Netherlands: Springer Netherlands. Following Franz Brentano, Husserl described this method as "descriptive psychology".Readings on Edmund Husserl’s Logical Investigations. (2012). Netherlands: Springer Netherlands. p. 202 Husserl is concerned with how mathematical knowledge works, and under the influence of Gottlob Frege, renounced his psychologism from the earlier Philosophy of Arithmetic. Husserl's book became the key text of the psychologism dispute.Carr, D. (2007). Husserl’s Attack on Psychologism and its Cultural Implications. In: Lau, KY., Drummond, J.J. (eds) Husserl’s Logical Investigations in the New Century: Western and Chinese Perspectives. Contributions to Phenomenology, vol 55. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-5758-8_3 The third Logical Investigation contains the first attempt at a systematic theory of mereology, later pioneered by Stanislaw Lesniewski.
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