In contemporary philosophy of science, ontological reductionism, or the claim that everything that exists in the world is something physical, is the consensus mainstream position. Contrary to a widespread belief, this book establishes that ontological and epistemological reductionism stand or fall together. The author proposes a new strategy of conservative theory reduction that operates by means of the construction of functional sub-concepts that are coextensional with physical concepts. Thus, a complete conservative reductionism is established that vindicates both the indispensable...