Non‐Locality

Abstract This chapter examines several locality conditions. It argues that two of these principles are irreducibly causal: the principle that all causal propagation takes place at a finite velocity of which relativistic locality is a special case, and spatiotemporal locality, according to which no causal influences can be transmitted across spatiotemporal ‘gaps’. Neither of the two causal principles can be reduced to the noncausal condition of diachronic locality.