This thesis intends to analyse the notions of transcendental deduction and basic norm, presented in the works of Kant and Kelsen, respectively. These concepts are used by the authors quoted as a form to legitimize the objective validity of knowledge, in a general sense in Kant, and specifically the knowledge of Law in Kelsen. The idea to carry out this comparison originated from the analogy used by Kelsen, in his book Pure Theory of Law, between the Kantian categories of understanding, justified through of the transcendental deduction in the Critique of Pure Reason, and the basic norm, where the two notions appear like conditions of the possibility of knowledge. The work is divided into two chapters that deal, respectively, of the transcendental deduction, Objectives, strategies and method of the transcendental deduction of the categories , and of the basic norm, The legal thought of Kelsen and the Kantian s inspiration of the basic norm . Each of them will try to present the assumptions and characteristics of the concepts in question, starting from the objectives that led Kant and Kelsen to formulate them as forms of legitimation of knowledge. Finally, a comparison between the two projects and a discussion about the possibility of a transcendental deduction of the basic norm will be expounded, as well as some conclusions that can be drawn from the work / Este trabalho pretende analisar as noções de dedução transcendental e norma fundamental, apresentadas nas obras de Kant e Kelsen, respectivamente. Tais conceitos são utilizados pelos referidos autores como forma de legitimar a validade objetiva de conhecimento, de maneira geral em Kant, e especificamente o conhecimento do Direito em Kelsen. A idéia de realizar essa comparação surgiu da analogia realizada por Kelsen, em sua obra Teoria Pura do Direito, entre as categorias do entendimento kantianas, justificadas através da dedução transcendental na Crítica da Razão Pura, e a norma fundamental, onde ambas as noções aparecem como condições da possibilidade de conhecimento. O trabalho está dividido em dois capítulos que tratam, respectivamente, da dedução transcendental, Objetivos, estratégias e método da dedução transcendental das categorias , e da norma fundamental, O pensamento jurídico de Kelsen e a inspiração kantiana da norma fundamental . Cada um deles tentará expor os pressupostos e características dos conceitos em questão, a partir dos objetivos que levaram Kant e Kelsen a formulá-los como formas de legitimação de conhecimento. Ao final, será realizada uma comparação entre os dois projetos e uma discussão sobre a possibilidade de uma dedução transcendental da norma fundamental, além da exposição de algumas conclusões que podem ser retiradas do trabalho

Cette thèse cherche à reconstituer les bases philosophiques de la pensée juridique de H.L.A. Hart (1907-1992), figure majeure du positivisme juridique anglo-saxon au XXe siècle, et professeur de jurisprudence à l'université d'Oxford de 1952 à 1968. Ses travaux demeurent largement méconnus en France.Dégager les sources philosophiques du « positivisme analytique » de Hart permettra, premièrement, de reconstruire le dialogue entre le juriste d'Oxford et certaines figures importantes de la théorie du droit continentale. Hart oppose d’importantes critiques à certaines formes continentales de positivisme juridique, comme le normativisme de Hans Kelsen ou le réalisme scandinave d'Alf Ross. Cependant, cette thèse montrera également qu'il est possible d'établir des rapprochements étroits entre la pensée de Hart et celle du juriste francophone Chaïm Perelman. L'étude des bases philosophiques de la pensée juridique de Hart offre ainsi des points de contact intéressants entre ces différentes cultures juridiques.Deuxièmement, cette thèse cherche à faire ressortir l'influence déterminante de la philosophie du langage ordinaire qui se développa à Oxford au lendemain de la Seconde Guerre mondiale. Notre propos s'appuiera notamment sur un « premier corpus » de textes philosophiques publiés avant son accession à la chaire de jurisprudence en 1952, ainsi que sur les travaux préparatoires à son ouvrage The Concept of Law (1961). Nous défendons l'idée que ses prises de position philosophiques se retrouvent dans sa réflexion juridique et permettent de comprendre la cohérence de son œuvre, ainsi que la forme d'empirisme juridique qui sous-tend sa conception de la notion de Constitution. / This thesis bears on the implicit epistemology and methodological considerations underlying the legal philosophy of H.L.A. Hart (1907-1992), the major representative of XXth century legal positivism in the English speaking world, and Oxford chair of jurisprudence (1952-1968). His work remains little known in France.We will seek to answer the view that Hart might not really have been durably influenced by ordinary language philosophy. We will address these questions by examining a corpus of earlier (overlooked) articles which he published as a young Oxford linguistic philosopher. This “early work” consists of the articles which Hart published before he in was elected to the Oxford chair of jurisprudence. Our view is that the work in general philosophy which he did in this early period is crucial to understand some of the positions which he defends in his legal writings. This thesis will thus show that Hart was active in the epistemological debate opposing the Oxford philosophers and the British representatives of logical atomism and logical empiricism. It will also show that these early positions are carried over into his later jurisprudence, including his major work The Concept of Law (1961).Shedding light on these philosophical foundations of Hart’s legal theory will ultimately allow us to reconstruct the debate opposing his own “analytical positivism” and Continental forms of positivism, such as Hans Kelsen’s normativism or Alf Ross Scandinavian legal realism. It will also allow us to draw important parallels between Hartian legal theory and that of the francophone philosopher Chaïm Perelman.