Adding Constants to String Rewriting

René Thiemann, Hans Zantema, Jürgen Giesl, and Peter Schneider-Kamp

Applicable Algebra in Engineering, Communication and Computing 19(1), pp. 27 – 38, 2008.


We consider unary term rewriting, i.e., term rewriting with unary signatures where all function symbols are either unary or constants. Terms over such signatures can be transformed into strings by just reading all symbols in the term from left to right, ignoring the optional variable. By lifting this transformation to rewrite rules, any unary term rewrite system (TRS) is transformed into a corresponding string rewrite system (SRS). We investigate which properties are preserved by this transformation. It turns out that any TRS over a unary signature is terminating if and only if the corresponding SRS is terminating. In this way tools for proving termination of string rewriting can be applied for proving termination of unary TRSs. For other rewriting properties including confluence, unique normal form property, weak normalization and relative termination, we show that a similar corresponding preservation property does not hold.


  PDF |    doi:10.1007/s00200-008-0060-6  |  © Springer


author = "Ren{\'e} Thiemann and Hans Zantema and J{\"u}rgen Giesl and Peter Schneider-Kamp",
title = "Adding Constants to String Rewriting",
journal = "Applicable Algebra in Engineering, Communication and Computing",
volume = 19,
number = 1,
year = 2008,
pages = "27--38"
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