Directory [tphols-2011] is added to host the commented version of [Myhill.thy]. Directory [pres] is created to host a build session for logical image [ListP] which is essentially [Main] extended with [List_prefix.thy].

(*<*)
theory Paper
imports Main
begin
(*>*)

section {* Introduction *}

text {*
  
*}

(*<*)
end
(*>*)