Abstract

Einstein claimed that we do not know what it means to say that events distant from one another are simultaneous, because there is no way to determine this operationally. Reichenbach and Grunbaum claimed that determinate time relations just do not exist among events not connectible by a causal signal and that, therefore, such relations can, within certain limits, be stipulated by convention. But I argue that the independent existence of such relations is demonstrated by asking and answering a series of questions based on the intelligibility, though not the existence, of faster‐than‐light signals. I further argue that (1) only by demonstrating the unintelligibility of such questions and their answers can the conventionality thesis be maintained; (2) none of the available arguments to show such unintelligibility works; and (3) the conventionality thesis is therefore false.