On April 8, 1859, German philosopher and mathematician Edmund Gustav Albrecht Husserl was born. He is best know as the founder of the 20th century philosophical school of phenomenology, where he broke with the positivist orientation of the science and philosophy of his day, yet he elaborated critiques of historicism and of psychologism in logic.
“First, anyone who seriously intends to become a philosopher must “once in his life” withdraw into himself and attempt, within himself, to overthrow and build anew all the sciences that, up to then, he has been accepting.”
Edmund Husserl, Cartesian Meditations (1931). Méditations cartésiennes
Edmund Husserl studied astronomy in Leipzig, but also attended several lectures in mathematics, physics and philosophy. Three years later, he continued his studies in Berlin and then completed his PhD in Vienna. Austria, and especially Franz Brentano, had a great influence on the scientist. Together, they studied logic and psychology, and Brentano suggested Husserl to finish his habilitation dissertation with Carl Stumpf in Halle.
When Husserl published his first monograph, the ‘Philosophy of Arithmetic‘, based on his dissertation, he combined his mathematical, psychological and philosophical knowledge in order to lay the foundations for arithmetic in psychology. However, it was Gottlob Frege, a founder of modern logic, who criticized Husserl’s work for its underlying psychologism. Therefore Husserl began developing the philosophical method of phenomenology.
At the very beginning of the 1900’s, he published his first work on the subject, ‘Logical Investigations‘ consisting of two volumes. In the work, Husserl attacked psychologism in general and explained “descriptive-psychological” and “epistemological” investigations. The work is credited with making continental philosophy possible and it depicted a significant foundation of phenomenology, going beyond systems like psychologism, formalism or realism.
In the following years, Edmund Husserl improved and modified his phenomenology methods and published his second major work in this field, ‘Ideas‘ in 1913 while working at the University of Göttingen. In Göttingen, Husserl presumably experienced his most productive years, developing the transcendental-phenomenological method, the phenomenological structure of time-consciousness and many more. Those were critically important for later publications, such as ‘The Crisis of European Sciences and Transcendental Phenomenology‘ and ‘Experience and Judgement‘.
Husserl criticized the logicians of his day for not focusing on the relation between subjective processes that give us objective knowledge of pure logic. All subjective activities of consciousness need an ideal correlate, and objective logic (constituted noematically) as it is constituted by consciousness needs a noetic correlate (the subjective activities of consciousness). He stated that logic has three strata, each further away from consciousness and psychology than those that precede it.
- The first stratum is what Husserl called a “morphology of meanings” concerning a priori ways to relate judgments to make them meaningful. In this stratum we elaborate a “pure grammar” or a logical syntax, and he would call its rules “laws to prevent non-sense”, which would be similar to what logic calls today “formation rules“. Mathematics, as logic’s ontological correlate, also has a similar stratum, a “morphology of formal-ontological categories“.
- The second stratum would be called by Husserl “logic of consequence” or the “logic of non-contradiction” which explores all possible forms of true judgments. He includes here syllogistic classic logic, propositional logic and that of predicates. This is a semantic stratum, and the rules of this stratum would be the “laws to avoid counter-sense” or “laws to prevent contradiction“. They are very similar to today’s logic “transformation rules“. Mathematics also has a similar stratum which is based among others on pure theory of pluralities, and a pure theory of numbers. They provide a science of the conditions of possibility of any theory whatsoever. Husserl also talked about what he called “logic of truth” which consists of the formal laws of possible truth and its modalities, and precedes the third logical third stratum.
- The third stratum is metalogical, what he called a “theory of all possible forms of theories.” It explores all possible theories in an a priori fashion, rather than the possibility of theory in general. We could establish theories of possible relations between pure forms of theories, investigate these logical relations and the deductions from such general connection. The logician is free to see the extension of this deductive, theoretical sphere of pure logic.
In his last active working years, Edmund Husserl gave lectures across Europe on phenomenology. After his passing on April 27, 1938, over 40000 pages of manuscripts have been found and depicted the foundation for the first Husserl archive, established in 1939.
Husserl’s influence on European universities was enormous. He was invited to numerous talks and many institutions adapted his theories quickly. He was known as a fascinating teacher and scientist with Martin Heidegger as his most famous student. He dedicated his work ‘Being and Time‘ to his former teacher even though the two scientists often had a difficult relationship due to Heidegger’s affiliation for the Nazi Party in Germany. Husserl influenced many younger scientists in concerns of their publications and methods. Jean-Paul Sartre also admired Husserl’s work, but rejected the transcendental theories and decided to rather follow Heideggers ontologies. Further admirers of Edmund Husserl were Kurt Gödel, Wilfrid Sellars, Jacques Derrida and many more.
At yovisto academic video search you may learn more about Edmund Husserl and Heidegger through a German lecture by Prof. Dr. Günther Figal at the University of Freiburg.
References and Further Reading:
-  Edmund Husserl Formal Ontology and Transcendental Logic
-  Edmund Husserl at Stanford Encyclopedia of Philosophy
-  Husserl Websites
-  Gottlob Frege and the Begriffsschrift, SciHi Blog
-  Martin Heidegger and the Question of Being, SciHi Blog
-  A Writer should not Allow Himself to be Turned into an Institution – Jean-Paul Sartre, SciHi Blog
-  Kurt Gödel and the Foundations of Mathematics, SciHi Blog
-  Edmund Husserl at Wikidata