Iterative Dialogues and Automated Proof

In previous work Boulton et al., 1998], we have built a proof system that joins an interactive tactic-based theorem prover for a classical logic Gordon and Melham, 1993] with a fully automatic proof planner for a constructive logic Bundy et al., 1990]. This combined system signiicantly improves the automation of the interactive prover, but is unsatisfactory for several reasons. To overcome these drawbacks, we propose a general scheme whereby the combined system can pass through multiple rounds of interaction in searching for a proof. This scheme has been implemented and ooers an important increase in the power and usability of the combined system.