Intrinsic, Extrinsic, and the Constitutive A Priori

On the basis of what I call physico-formalist philosophy of mathematics, I will develop an amended account of the Kantian-Reichenbachian conception of constitutive a priori. It will be shown that the features (attributes, qualities, properties) attributed to a real object are not possessed by the object as a "thing-in-itself"; they require a physical theory by means of which these features are constituted. It will be seen that the existence of such a physical theory implies that a physical object can possess a property only if other contingently existing physical objects exist; therefore, the intrinsic-extrinsic distinction is flawed.