Two Forms of One Useful Logic: Existential Fixed Point Logic and Liberal Datalog

Published 6 Nov 2008 in cs.LO | (0811.0977v1)

Abstract: A natural liberalization of Datalog is used in the Distributed Knowledge Authorization Language (DKAL). We show that the expressive power of this liberal Datalog is that of existential fixed-point logic. The exposition is self-contained.

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