Levels of Undecidability in Infinitary Rewriting: Normalization and Reachability

Published 4 Mar 2010 in cs.LO and cs.CC | (1003.1057v1)

Abstract: In [EGZ09] it has been shown that infinitary strong normalization (SNi) is Pi-1-1-complete. Suprisingly, it turns out that infinitary weak normalization (WNi) is a harder problem, being Pi-1-2-complete, and thereby strictly higher in the analytical hierarchy.

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Joerg Endrullis

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