Logic Programming pair #487096332

details

property	value
status	complete
benchmark	times2.pl
ran by	Akihisa Yamada
cpu timeout	1200 seconds
wallclock timeout	300 seconds
memory limit	137438953472 bytes
execution host	n146.star.cs.uiowa.edu
space	SGST06

run statistics

property	value
solver	AProVE
configuration	standard
runtime (wallclock)	2.63463 seconds
cpu usage	7.26144
user time	6.9193
system time	0.342141
max virtual memory	1.887706E7
max residence set size	605860.0

stage attributes

key	value
starexec-result	YES

output

YES
proof of /export/starexec/sandbox2/benchmark/theBenchmark.pl
# AProVE Commit ID: 794c25de1cacf0d048858bcd21c9a779e1221865 marcel 20200619 unpublished dirty


Left Termination of the query pattern

times(g,g,a)

w.r.t. the given Prolog program could successfully be proven:

(0) Prolog
(1) PrologToPiTRSProof [SOUND, 0 ms]
(2) PiTRS
(3) DependencyPairsProof [EQUIVALENT, 4 ms]
(4) PiDP
(5) DependencyGraphProof [EQUIVALENT, 0 ms]
(6) AND
    (7) PiDP
        (8) UsableRulesProof [EQUIVALENT, 0 ms]
        (9) PiDP
        (10) PiDPToQDPProof [SOUND, 0 ms]
        (11) QDP
        (12) QDPSizeChangeProof [EQUIVALENT, 0 ms]
        (13) YES
    (14) PiDP
        (15) UsableRulesProof [EQUIVALENT, 0 ms]
        (16) PiDP
        (17) PiDPToQDPProof [SOUND, 0 ms]
        (18) QDP
        (19) QDPSizeChangeProof [EQUIVALENT, 0 ms]
        (20) YES
    (21) PiDP
        (22) UsableRulesProof [EQUIVALENT, 0 ms]
        (23) PiDP
        (24) PiDPToQDPProof [SOUND, 0 ms]
        (25) QDP
        (26) QDPSizeChangeProof [EQUIVALENT, 0 ms]
        (27) YES
    (28) PiDP
        (29) UsableRulesProof [EQUIVALENT, 0 ms]
        (30) PiDP
        (31) PiDPToQDPProof [SOUND, 1 ms]
        (32) QDP
        (33) MRRProof [EQUIVALENT, 23 ms]
        (34) QDP
        (35) DependencyGraphProof [EQUIVALENT, 0 ms]
        (36) TRUE


----------------------------------------

(0)
Obligation:
Clauses:

even(0, true).
even(s(0), false).
even(s(s(X)), B) :- even(X, B).
half(0, 0).
half(s(s(X)), s(Y)) :- half(X, Y).
plus(0, Y, Y).
plus(s(X), Y, s(Z)) :- plus(X, Y, Z).
times(0, Y, 0).
times(s(X), Y, Z) :- ','(even(s(X), B), if(B, s(X), Y, Z)).
if(true, s(X), Y, Z) :- ','(half(s(X), X1), ','(times(X1, Y, Y1), plus(Y1, Y1, Z))).
if(false, s(X), Y, Z) :- ','(times(X, Y, U), plus(Y, U, Z)).


Query: times(g,g,a)
----------------------------------------

(1) PrologToPiTRSProof (SOUND)
We use the technique of [TOCL09]. With regard to the inferred argument filtering the predicates were used in the following modes:

times_in_3: (b,b,f)

even_in_2: (b,f)

if_in_4: (b,b,b,f)

half_in_2: (b,f)

plus_in_3: (b,b,f)

Transforming Prolog into the following Term Rewriting System:

Pi-finite rewrite system:
The TRS R consists of the following rules:

   times_in_gga(0, Y, 0) -> times_out_gga(0, Y, 0)
   times_in_gga(s(X), Y, Z) -> U4_gga(X, Y, Z, even_in_ga(s(X), B))
   even_in_ga(0, true) -> even_out_ga(0, true)
   even_in_ga(s(0), false) -> even_out_ga(s(0), false)
   even_in_ga(s(s(X)), B) -> U1_ga(X, B, even_in_ga(X, B))
   U1_ga(X, B, even_out_ga(X, B)) -> even_out_ga(s(s(X)), B)
   U4_gga(X, Y, Z, even_out_ga(s(X), B)) -> U5_gga(X, Y, Z, if_in_ggga(B, s(X), Y, Z))
   if_in_ggga(true, s(X), Y, Z) -> U6_ggga(X, Y, Z, half_in_ga(s(X), X1))
   half_in_ga(0, 0) -> half_out_ga(0, 0)
   half_in_ga(s(s(X)), s(Y)) -> U2_ga(X, Y, half_in_ga(X, Y))

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