Title:A PVS Proof Obligation Generator for Lustre Programs Authors:Cecile Canovas-Dumas, Paul Caspi Abstract: This paper presents a tool for proving safety properties of Lustre programs in PVS, based on continuous induction. The tool applies off-line a repeated induction strategy and generates proof obligations left to PVS. We show on examples how it avoids some drawbacks of co-induction which needs to consider ``absent elements'' in the case of clocked streams.