Gappa stands for Génération Automatique de Preuves de Propriétés Arithmétiques (Automatic Proof Generation of Arithmetic Properties). It is a tool intended to help verifying and formally proving properties on numerical programs dealing with floating-point or fixed-point arithmetic. It has been used to write robust floating-point filters for CGAL and it is used to certify elementary functions in CRlibm. While Gappa is intended to be used directly, it can also act as a backend prover for the Why3 software verification plateform or as an automatic tactic for the Coq proof assistant.

See the online documentation.