This paper interprets Heidegger's frequently misunderstood criticisms of logic by presenting them in their historical context. To this end, it surveys the state of logic in the late 19th century and presents the main systematic conception of neo-Kantian logical idealism, noting Heidegger's own early involvement in these schools of thought. The paper goes on to present arguments from Heidegger's earliest lectures in which he develops both the phenomenology of everydayness and his criticisms of logic in an attempt to undermine the (...) neo-Kantian conception. These two approaches turn out to be inseparable in Heidegger's thought. Heidegger's criticism of logic amounts to a rejection of the claim that the possibility of experiencing objects is entirely grounded in logical constitution by the spontaneous understanding. There are other, more fundamental modes of disclosing objects. Heidegger is defended against the charge or irrationalism. The paper ends by interpreting the most important logic-related claims of What is Metaphysics? and outlining a Heideggerian response to Carnap's famous criticisms. (shrink)

O presente artigo examina a relação entre lógica e filosofia a partir das teses críticas apresentadas por Heidegger ao longo dos escritos que culminam em "O que é metafísica?". Em particular, mostra-se que a polêmica afirmação sobre o fim do primado da lógica na filosofia, enunciada com a tese acerca da relação entre o nada e a negação, tem como alvo crítico o assim chamado idealismo lógico da Escola de Marburg, não representando um ataque geral à lógica enquanto lógica formal, (...) pura e simplesmente. Tomando a noção de "idéia", em sentido kantiano, com a tese da dissolução da idéia da lógica, Heidegger pretende uma limitação fundamental em toda investigação ontológica conduzida por uma reflexão lógico-transcendental, independentemente do modo como possa ser melhorada ou até mesmo reformulada. O problema do nada, tematizado em "O que é metafísica?", é analisado aqui como o caso limite do primado da lógica no questionamento ontológico.Based on the critical theses presented by Heidegger in texts which culminate in Was ist Metaphysik?, the present paper deals with the relation between Logic and Philosophy. It shows specifically that the polemic statement about the end of the primacy of Logic in Philosophy, founded on the thesis of the relation between negation and nothing, has as its critical target the so-called logical idealism of the Marburg School, and does not intend a general attack on formal Logic simpliciter. Taking in account the Kantian notion of "idea", Heidegger intended in the thesis of the dissolution of the idea of Logic a fundamental limitation for every ontological investigation grounded in logical-transcendental reflection, regardless of the way it can be improved, or reformulated. The question of nothing approached in Was ist Metaphysik? is analyzed here as a case that demonstrates the limits of the primacy of Logic in ontological questions. (shrink)