Trata-se de mostrar que o interesselógico do primeiro Heidegger, sobretudo em Seinund Zeit, é guiado pela distinção de principioentre lógica e lógica produtiva, de forma a traduzira questão ontológica em termos fenomenológicose hermenêuticos.

What licenses the use of a definite description? The formal and philosophical literature has approached this question in two ways. The uniqueness approach (Frege, 1892; Russell, 1905; Strawson, 1950) holds that we may use a definite determiner only if the property denoted by its complement holds of exactly one individual in some domain: Sentence (1) and (2) can only be true if there is exactly one king of France, and exactly one American governor, respectively. Since this is not the case (...) in the actual world, the sentences are either false or (on most modern accounts) fall prey to a presupposition failure. (shrink)