Coalescing: Syntactic Abstraction for Reasoning in First-Order Modal   Logics
  We present a syntactic abstraction method to reason about first-order modal logics by using theorem provers for standard first-order logic and for propositional modal logic. 
Damien Doligez (INRIA Paris-Rocquencourt), Jael Kriener (MSR - INRIA),   Leslie Lamport, Tomer Libal (MSR - INRIA), Stephan ...
cs.LO