Certification Problem

Input (TPDB TRS_Standard/Transformed_CSR_04/LISTUTILITIES_complete_L)

The rewrite relation of the following TRS is considered.

U11(tt) snd(splitAt(N,XS)) (1)
U161(tt) cons(N) (2)
U171(tt) head(afterNth(N,XS)) (3)
U181(tt) Y (4)
U191(tt) pair(nil,XS) (5)
U201(tt) U202(splitAt(N,XS)) (6)
U202(pair(YS,ZS)) pair(cons(X),ZS) (7)
U21(tt) X (8)
U211(tt) XS (9)
U221(tt) fst(splitAt(N,XS)) (10)
U31(tt) N (11)
and(tt) X (12)
U101(tt) U102(isNatural) (13)
U102(tt) U103(isLNat) (14)
U103(tt) tt (15)
U111(tt) U112(isLNat) (16)
U112(tt) tt (17)
U121(tt) U122(isNatural) (18)
U122(tt) tt (19)
U131(tt) U132(isNatural) (20)
U132(tt) U133(isLNat) (21)
U133(tt) tt (22)
U141(tt) U142(isLNat) (23)
U142(tt) U143(isLNat) (24)
U143(tt) tt (25)
U151(tt) U152(isNatural) (26)
U152(tt) U153(isLNat) (27)
U153(tt) tt (28)
U41(tt) U42(isNatural) (29)
U42(tt) U43(isLNat) (30)
U43(tt) tt (31)
U51(tt) U52(isNatural) (32)
U52(tt) U53(isLNat) (33)
U53(tt) tt (34)
U61(tt) U62(isPLNat) (35)
U62(tt) tt (36)
U71(tt) U72(isNatural) (37)
U72(tt) tt (38)
U81(tt) U82(isPLNat) (39)
U82(tt) tt (40)
U91(tt) U92(isLNat) (41)
U92(tt) tt (42)
afterNth(N,XS) U11(and(and(isNatural))) (43)
fst(pair(X,Y)) U21(and(and(isLNat))) (44)
head(cons(N)) U31(and(and(isNatural))) (45)
isLNat tt (46)
isLNat U41(and(isNaturalKind)) (47)
isLNat U51(and(isNaturalKind)) (48)
isLNat U61(isPLNatKind) (49)
isLNat U71(isNaturalKind) (50)
isLNat U81(isPLNatKind) (51)
isLNat U91(isLNatKind) (52)
isLNat U101(and(isNaturalKind)) (53)
isLNatKind tt (54)
isLNatKind and(isNaturalKind) (55)
isLNatKind isPLNatKind (56)
isLNatKind isNaturalKind (57)
isLNatKind isLNatKind (58)
isNatural tt (59)
isNatural U111(isLNatKind) (60)
isNatural U121(isNaturalKind) (61)
isNatural U131(and(isNaturalKind)) (62)
isNaturalKind tt (63)
isNaturalKind isLNatKind (64)
isNaturalKind isNaturalKind (65)
isNaturalKind and(isNaturalKind) (66)
isPLNat U141(and(isLNatKind)) (67)
isPLNat U151(and(isNaturalKind)) (68)
isPLNatKind and(isLNatKind) (69)
isPLNatKind and(isNaturalKind) (70)
natsFrom(N) U161(and(isNatural)) (71)
sel(N,XS) U171(and(and(isNatural))) (72)
snd(pair(X,Y)) U181(and(and(isLNat))) (73)
splitAt(0,XS) U191(and(isLNat)) (74)
splitAt(s(N),cons(X)) U201(and(and(isNatural))) (75)
tail(cons(N)) U211(and(and(isNatural))) (76)
take(N,XS) U221(and(and(isNatural))) (77)

Property / Task

Prove or disprove termination.

Answer / Result

No.

Proof (by AProVE @ termCOMP 2023)

1 Variable Condition Violated

The TRS violates one of the two variable conditions. Thus, it is not terminating.