Modularity of Convergence and Strong Convergence in Infinitary Rewriting

Details Modularity of Convergence and Strong Convergence in Infinitary Rewriting Modularity of Convergence and Strong Convergence in Infinitary Rewriting

2010-06-15

arxiv.org/abs/1006.2944v2

LMCS 6 (3:18) 2010

Computer Science

Logic in Computer Science

Scientific paper

10.2168/LMCS-6(3:18)2010

Properties of Term Rewriting Systems are called modular iff they are preserved under (and reflected by) disjoint union, i.e. when combining two Term Rewriting Systems with disjoint signatures. Convergence is the property of Infinitary Term Rewriting Systems that all reduction sequences converge to a limit. Strong Convergence requires in addition that redex positions in a reduction sequence move arbitrarily deep. In this paper it is shown that both Convergence and Strong Convergence are modular properties of non-collapsing Infinitary Term Rewriting Systems, provided (for convergence) that the term metrics are granular. This generalises known modularity results beyond metric \infty.

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