0.00/0.08 YES 0.00/0.08 We consider the system theBenchmark. 0.00/0.08 0.00/0.08 Alphabet: 0.00/0.08 0.00/0.08 cons : [c * d] --> d 0.00/0.08 fcons : [b -> c * a] --> a 0.00/0.08 fmap : [a * b] --> d 0.00/0.08 fnil : [] --> a 0.00/0.08 nil : [] --> d 0.00/0.08 0.00/0.08 Rules: 0.00/0.08 0.00/0.08 fmap(fnil, x) => nil 0.00/0.08 fmap(fcons(f, x), y) => cons(f y, fmap(x, y)) 0.00/0.08 0.00/0.08 This AFS is converted to an AFSM simply by replacing all free variables by meta-variables (with arity 0). 0.00/0.08 0.00/0.08 We use the dependency pair framework as described in [Kop12, Ch. 6/7], with static dependency pairs (see [KusIsoSakBla09] and the adaptation for AFSMs and accessible arguments in [Kop13]). 0.00/0.08 0.00/0.08 We thus obtain the following dependency pair problem (P_0, R_0, static, formative): 0.00/0.08 0.00/0.08 Dependency Pairs P_0: 0.00/0.08 0.00/0.08 0] fmap#(fcons(F, X), Y) =#> fmap#(X, Y) 0.00/0.08 0.00/0.08 Rules R_0: 0.00/0.08 0.00/0.08 fmap(fnil, X) => nil 0.00/0.08 fmap(fcons(F, X), Y) => cons(F Y, fmap(X, Y)) 0.00/0.08 0.00/0.08 Thus, the original system is terminating if (P_0, R_0, static, formative) is finite. 0.00/0.08 0.00/0.08 We consider the dependency pair problem (P_0, R_0, static, formative). 0.00/0.08 0.00/0.08 We apply the subterm criterion with the following projection function: 0.00/0.08 0.00/0.08 nu(fmap#) = 1 0.00/0.08 0.00/0.08 Thus, we can orient the dependency pairs as follows: 0.00/0.08 0.00/0.08 nu(fmap#(fcons(F, X), Y)) = fcons(F, X) |> X = nu(fmap#(X, Y)) 0.00/0.08 0.00/0.08 By [Kop12, Thm. 7.35] and [Kop13, Thm. 5], we may replace a dependency pair problem (P_0, R_0, static, f) by ({}, R_0, static, f). By the empty set processor [Kop12, Thm. 7.15] this problem may be immediately removed. 0.00/0.08 0.00/0.08 As all dependency pair problems were succesfully simplified with sound (and complete) processors until nothing remained, we conclude termination. 0.00/0.08 0.00/0.08 0.00/0.08 +++ Citations +++ 0.00/0.08 0.00/0.08 [Kop12] C. Kop. Higher Order Termination. PhD Thesis, 2012. 0.00/0.08 [Kop13] C. Kop. Static Dependency Pairs with Accessibility. Unpublished manuscript, http://cl-informatik.uibk.ac.at/users/kop/static.pdf, 2013. 0.00/0.08 [KusIsoSakBla09] K. Kusakari, Y. Isogai, M. Sakai, and F. Blanqui. Static Dependency Pair Method Based On Strong Computability for Higher-Order Rewrite Systems. In volume 92(10) of IEICE Transactions on Information and Systems. 2007--2015, 2009. 0.00/0.08 EOF