ABSTRACT
This chapter attempts to formulate a plausible set of transcendental constraints of posthuman possibility with the help of central thinkers in the transcendental tradition such as Kant, Davidson, Husserl and Heidegger. Claims about hypothetical technological possibility may be as vulnerable to refutation as naive physics. States like the US and China employ computers to co-ordinate military activities so a Skynet seems the more plausible posthuman antagonist. Any physical limits on information storage density and processor speed will presumably constrain all occupants of posthuman possibility space (PPS) unless fundamental physical laws or powers can change. Putnam presents this idea in terms of a branch of mathematical logic known as 'model theory'. Model theory is an abstract way of understanding the links between formal languages and the 'world' their sentences are about. Meaning-holism and psychological holism reflect the structural openness of local constellations of practices to the things with which they are engaged.
