Theory RG_Com (Isabelle2019: June 2019)

chapter ‹The Rely-Guarantee Method›

section ‹Abstract Syntax›

theory RG_Com imports Main begin

text ‹Semantics of assertions and boolean expressions (bexp) as sets
of states.  Syntax of commands ‹com› and parallel commands
‹par_com›.›

type_synonym 'a bexp = "'a set"

datatype 'a com =
    Basic "'a ⇒'a"
  | Seq "'a com" "'a com"
  | Cond "'a bexp" "'a com" "'a com"
  | While "'a bexp" "'a com"
  | Await "'a bexp" "'a com"

type_synonym 'a par_com = "'a com option list"

end