Two Refutations of the Vorhanden Reading of Heidegger’s Philosophy of Science in Being and Time

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The dominant interpretation of Heidegger’s philosophy of science in Being and Time is that he defines science, or natural science, in terms of presence-at-hand (Vorhandenheit). I argue that this interpretation is false. I call this dominant view about Heidegger’s definition of science the vorhanden claim; interpreters who argue in favor of this claim I call vorhanden readers. In the essay, I reconstruct and then refute two major arguments for the vorhanden claim: respectively, I call them equipmental breakdown (Section 1) and theoretical assertion (Section 2). The equipmental breakdown argument, stemming mainly from Hubert Dreyfus, advances a vorhanden reading on the basis of three other interpretive claims: I call them, respectively, the primacy of practice claim, the decontextualization claim, and the breakdown claim. While I remain agnostic on the first claim, the argument fails because of decisive textual counterevidence to the latter two claims. Meanwhile, the theoretical assertion argument, which I reconstruct mainly from Robert Brandom, premises its vorhanden claim on the basis of some remarks in Being and Time indicating that theoretical assertions, as such, refer to present-at-hand things. Since science is taken to be a paradigmatic case of an activity that makes theoretical assertions, the vorhanden claim is supposed to follow. I refute this argument on the grounds that it equivocates on Heidegger’s concept of “theoretical assertion” and cannot account for his insistence that science does not principally consist in the production of such assertions. I conclude that, with the failure of these two arguments, the case for the vorhanden claim is severely weakened.