Express trans_db with Option.map and Option.bind. Possibly mbind is a copy of bind?
(*<*)
theory Paper
imports "~~/src/HOL/Library/LaTeXsugar"
begin
declare [[show_question_marks = false]]
section {* Introduction *}
text {*
mention Russo paper which concludes that technology is not
ready beyond core-calculi.
*}
(*<*)
end
(*>*)