Adaptation of declaratively represented methods in proof planning

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The reasoning power of human-oriented plan-based reasoning systems is primarily derived from their domain-specific problem solving knowledge.Such knowledge is, however, intrinsically incomplete. In order to model the human ability of adapting existing methods to new situations we present in this work a declarative approach for representing methods, which can be adapted by so-called meta-methods. Since the computational success of this approach relies on the existence of general and strong meta-methods, we describe several meta-methods of general interest in detail by presenting the problem solving process of two familiar classes of mathematical problems. These examples should illustrate our philosophy of proof planning as well: besides planning with a pre-defined repertory of methods, the repertory of methods evolves with experience in that new ones are created by meta-methods that modify existing ones.

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