Abstract
We show that rigid reachability, the non-symmetric form of rigid E-unification, is undecidable already in the case of a single constraint. From this we infer the undecidability of a new rather restricted kind of second-order unification. We also show that certain decidable subclasses of the problem which are P-complete in the equational case become EXPTIME-complete when symmetry is absent. By applying automata-theoretic methods, simultaneous monadic rigid reachability with ground rules is shown to be in EXPTIME.
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Ganzinger, H., Jacquemard, F., Veanes, M. (1998). Rigid Reachability. In: Hsiang, J., Ohori, A. (eds) Advances in Computing Science ASIAN 98. ASIAN 1998. Lecture Notes in Computer Science, vol 1538. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-49366-2_2
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