Everybody knows the disappearing animal trick: rabbit goes into the hat, magician waves wand, and presto! The magician displays an empty hat. Simplistic though it sounds, this old act illustrates how literary critics historically have rendered the animal a non-issue. Reading animals as metaphors, always as figures of and for the human, is a process that likewise ends with the human alone on the...

Discovering unknown lemmas, generalisations and other eureka steps is a major challenge for automated theorem proving. Proof-planning critics can help automate these steps by making use of information from failed proof attempts. Our proposed research will extend existing critics for higher-order logic in the IsaPlanner system, as well as develop new critics. With the assistance of critics we ex...