Abstract

Proponents of practice-based accounts of science often reject theory-based accounts, and seek to explain scientific theory reductively in terms of practice. I consider two examples: Dimitri Ginev and Joseph Rouse. Both draw inspiration from Martin Heidegger’s existential conception of science. And both allege that Heidegger ultimately betrayed his insight that theory can be reduced to practice when he sought to explain modern science in terms of a theory-based “mathematical projection of nature.” I argue that Heidegger believed neither that theory can be reduced to practice nor that the mathematical projection is theory-based. For Heidegger, the mathematical projection is the existential condition of possibility for modern science. The theory and practice of modern science represent two distinct modes of this single existential ground state.