Theory RG_Com

theory RG_Com
imports Main

header {* \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 @{text com} and parallel commands
@{text 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