Model-checking ATL under Imperfect Information and Perfect Recall Semantics is Undecidable (joint work with Ferucio Tiplea)

We propose a formal proof of the undecidability of the model checking problem for alternating-time temporal logic under imperfect information and perfect recall semantics. This problem was announced to be undecidable according to a personal communication on multi-player games with imperfect information, but no formal proof was ever published. Our proof is based on a direct reduction from the non-halting problem for Turing machines.


 pdf file.