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TRS Stand 20472 pair #381710916
details
property
value
status
complete
benchmark
quotminus.xml
ran by
Akihisa Yamada
cpu timeout
1200 seconds
wallclock timeout
300 seconds
memory limit
137438953472 bytes
execution host
n038.star.cs.uiowa.edu
space
Rubio_04
run statistics
property
value
solver
Wanda
configuration
FirstOrder
runtime (wallclock)
0.103343963623 seconds
cpu usage
0.092094362
max memory
4136960.0
stage attributes
key
value
output-size
5859
starexec-result
YES
output
/export/starexec/sandbox2/solver/bin/starexec_run_FirstOrder /export/starexec/sandbox2/benchmark/theBenchmark.xml /export/starexec/sandbox2/output/output_files -------------------------------------------------------------------------------- YES We consider the system theBenchmark. We are asked to determine termination of the following first-order TRS. 0 : [] --> o Z : [] --> o min : [o * o] --> o plus : [o * o] --> o quot : [o * o] --> o s : [o] --> o plus(0, X) => X plus(s(X), Y) => s(plus(X, Y)) min(X, 0) => X min(s(X), s(Y)) => min(X, Y) min(min(X, Y), Z) => min(X, plus(Y, Z)) quot(0, s(X)) => 0 quot(s(X), s(Y)) => s(quot(min(X, Y), s(Y))) We use the dependency pair framework as described in [Kop12, Ch. 6/7], with static dependency pairs (see [KusIsoSakBla09] and the adaptation for AFSMs in [Kop12, Ch. 7.8]). We thus obtain the following dependency pair problem (P_0, R_0, minimal, formative): Dependency Pairs P_0: 0] plus#(s(X), Y) =#> plus#(X, Y) 1] min#(s(X), s(Y)) =#> min#(X, Y) 2] min#(min(X, Y), Z) =#> min#(X, plus(Y, Z)) 3] min#(min(X, Y), Z) =#> plus#(Y, Z) 4] quot#(s(X), s(Y)) =#> quot#(min(X, Y), s(Y)) 5] quot#(s(X), s(Y)) =#> min#(X, Y) Rules R_0: plus(0, X) => X plus(s(X), Y) => s(plus(X, Y)) min(X, 0) => X min(s(X), s(Y)) => min(X, Y) min(min(X, Y), Z) => min(X, plus(Y, Z)) quot(0, s(X)) => 0 quot(s(X), s(Y)) => s(quot(min(X, Y), s(Y))) Thus, the original system is terminating if (P_0, R_0, minimal, formative) is finite. We consider the dependency pair problem (P_0, R_0, minimal, formative). We place the elements of P in a dependency graph approximation G (see e.g. [Kop12, Thm. 7.27, 7.29], as follows: * 0 : 0 * 1 : 1, 2, 3 * 2 : 1, 2, 3 * 3 : 0 * 4 : 4, 5 * 5 : 1, 2, 3 This graph has the following strongly connected components: P_1: plus#(s(X), Y) =#> plus#(X, Y) P_2: min#(s(X), s(Y)) =#> min#(X, Y) min#(min(X, Y), Z) =#> min#(X, plus(Y, Z)) P_3: quot#(s(X), s(Y)) =#> quot#(min(X, Y), s(Y)) By [Kop12, Thm. 7.31], we may replace any dependency pair problem (P_0, R_0, m, f) by (P_1, R_0, m, f), (P_2, R_0, m, f) and (P_3, R_0, m, f). Thus, the original system is terminating if each of (P_1, R_0, minimal, formative), (P_2, R_0, minimal, formative) and (P_3, R_0, minimal, formative) is finite. We consider the dependency pair problem (P_3, R_0, minimal, formative). We will use the reduction pair processor with usable rules [Kop12, Thm. 7.44]. The usable rules of (P_3, R_0) are: plus(0, X) => X plus(s(X), Y) => s(plus(X, Y)) min(X, 0) => X min(s(X), s(Y)) => min(X, Y) min(min(X, Y), Z) => min(X, plus(Y, Z)) It suffices to find a standard reduction pair [Kop12, Def. 6.69]. Thus, we must orient: quot#(s(X), s(Y)) >? quot#(min(X, Y), s(Y)) plus(0, X) >= X plus(s(X), Y) >= s(plus(X, Y)) min(X, 0) >= X min(s(X), s(Y)) >= min(X, Y) min(min(X, Y), Z) >= min(X, plus(Y, Z))
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