Mechanising Mondex with Z/Eves

Abstract

We describe our experiences in mechanising the specification, refinement, and proof of the Mondex Electronic Purse using the Z/Eves theorem prover. We took a conservative approach and mechanised the original LaTEX sources without changing their technical content, except to correct errors. We found problems in the original specification and some missing invariants in the refinements. Based on these experiences, we present novel and detailed guidance on how to drive Z/Eves successfully. The work contributes to the Repository for the Verified Software Grand Challenge. © 2007 British Computer Society.