LIPIcs.CSL.2013.28.pdf
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In this talk we survey recent work in the quest for expressive logics with good algorithmic properties, starting from the two-variable fragment of first-order logic and the guarded fragment. While tracing the boundary between decidable and undecidable fragments we describe their power, limitations, similarities and differences in order to stress out key properties responsible for their good or bad behaviour. We also highlight tools and techniques that have proven most effective for designing optimal algorithms, special attention giving to the more universal ones.
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