avoid slightly odd "M" suffix; rename mapM to fold_map (fold_map_abort would be more correct, though)
(* Title: HOL/Imperative_HOL/Imperative_HOL.thy
Author: John Matthews, Galois Connections; Alexander Krauss, Lukas Bulwahn & Florian Haftmann, TU Muenchen
*)
header {* Entry point into monadic imperative HOL *}
theory Imperative_HOL
imports Array Ref Relational
begin
end