LETHE: saturation-based reasoning for non-standard reasoning tasks. We present the saturation-based reasoning system Lethe. Lethe is a tool that can be used for uniform interpolation, forgetting, TBox abduction and logical di erence. To solve these problems, Lethe uses saturation-based reasoning to eliminate certain symbols from an on- tology, such that entailments in the remaining vocabulary are preserved. This is known as forgetting or uniform interpolation. Lethe is an imple- mentation of our forgetting methods for various expressive description logics, and can be used as a Java library and as a standalone tool for the mentioned reasoning tasks. We give a high level description of the calculi used by Lethe, describe the reasoning algorithm implemented in Lethe, and give an evaluation of the system on realistic ontologies.

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  1. Zhao, Yizheng; Schmidt, Renate A.: FAME(Q): an automated tool for forgetting in description logics with qualified number restrictions (2019)