# Second-Order Quantifier Elimination on Relational Monadic Formulas – A Basic Method and Some Less Expected Applications (Extended Version)

##### Christoph WernhardChristoph Wernhard

Christoph Wernhard
Second-Order Quantifier Elimination on Relational Monadic Formulas – A Basic Method and Some Less Expected Applications (Extended Version)
Technical Report, TU Dresden, volume 15-04, 2015. Knowledge Representation and Reasoning
• KurzfassungAbstract
For relational monadic formulas (the Löwenheim class) second-order quantifier elimination, which is closely related to computation of uniform interpolants, forgetting and projection, always succeeds. The decidability proof for this class by Behmann from 1922 explicitly proceeds by elimination with equivalence preserving formula rewriting. We reconstruct Behmann's method, relate it to the modern DLS elimination algorithm and show some applications where the essential monadicity becomes apparent only at second sight. In particular, deciding ALCOQH knowledge bases, elimination in DL-Lite knowledge bases, and the justification of the success of elimination methods for Sahlqvist formulas.
• Weitere Informationen unter:Other info: Link
• Projekt:Project: SOA-VBQP
• Forschungsgruppe:Research Group: Wissensverarbeitung
```@techreport{W2015,
author      = {Christoph Wernhard},
title       = {Second-Order Quantifier Elimination on Relational Monadic
Formulas {\textendash} A Basic Method and Some Less Expected
Applications (Extended Version)},
institution = {TU Dresden},
year        = {2015}
}
```