, Volume 188, Issue 3, pp 469-485

First online:

Open Access This content is freely available online to anyone, anywhere at any time.

A letter on the present state of affairs

Prior, indeterminism and relativity 40 years later
  • Thomas MüllerAffiliated withDepartment of Philosophy, Utrecht University Email author 
  • , Niko StrobachAffiliated withPhilosophisches Institut, Universität des Saarlandes


The paper re-evaluates Prior’s tenets about indeterminism and relativity from the point of view of the current state of the debate. We first discuss Prior’s claims about indeterministic tense logic and about relativity separately and confront them with new technical developments. Then we combine the two topics in a discussion of indeterministic approaches to space–time logics. Finally we show why Prior would not have to “dig his heels in” when it comes to relativity: We point out a way of combining the existential import of the distinction between past, present, and future with a frame-relative notion of the present.


Philosophy of time A-theory Relativity theory Arthur Prior