The Runtime Complexity (full) of the given CpxTRS could be proven to be BOUNDS(2^n, INF).

(0) Obligation:

Runtime Complexity TRS:
The TRS R consists of the following rules:

a__from(X) → cons(mark(X), from(s(X)))
a__first(0, Z) → nil
a__first(s(X), cons(Y, Z)) → cons(mark(Y), first(X, Z))
a__sel(0, cons(X, Z)) → mark(X)
a__sel(s(X), cons(Y, Z)) → a__sel(mark(X), mark(Z))
mark(from(X)) → a__from(mark(X))
mark(first(X1, X2)) → a__first(mark(X1), mark(X2))
mark(sel(X1, X2)) → a__sel(mark(X1), mark(X2))
mark(cons(X1, X2)) → cons(mark(X1), X2)
mark(s(X)) → s(mark(X))
mark(0) → 0
mark(nil) → nil
a__from(X) → from(X)
a__first(X1, X2) → first(X1, X2)
a__sel(X1, X2) → sel(X1, X2)

Rewrite Strategy: FULL

(1) DecreasingLoopProof (EQUIVALENT transformation)

The following loop(s) give(s) rise to the lower bound Ω(2ⁿ):
The rewrite sequence
mark(from(X)) →⁺ cons(mark(mark(X)), from(s(mark(X))))
gives rise to a decreasing loop by considering the right hand sides subterm at position [0,0].
The pumping substitution is [X / from(X)].
The result substitution is [ ].

The rewrite sequence
mark(from(X)) →⁺ cons(mark(mark(X)), from(s(mark(X))))
gives rise to a decreasing loop by considering the right hand sides subterm at position [1,0,0].
The pumping substitution is [X / from(X)].
The result substitution is [ ].

(2) BOUNDS(2^n, INF)

(3) RenamingProof (EQUIVALENT transformation)

Renamed function symbols to avoid clashes with predefined symbol.

(4) Obligation:

Runtime Complexity Relative TRS:
The TRS R consists of the following rules:

a__from(X) → cons(mark(X), from(s(X)))
a__first(0', Z) → nil
a__first(s(X), cons(Y, Z)) → cons(mark(Y), first(X, Z))
a__sel(0', cons(X, Z)) → mark(X)
a__sel(s(X), cons(Y, Z)) → a__sel(mark(X), mark(Z))
mark(from(X)) → a__from(mark(X))
mark(first(X1, X2)) → a__first(mark(X1), mark(X2))
mark(sel(X1, X2)) → a__sel(mark(X1), mark(X2))
mark(cons(X1, X2)) → cons(mark(X1), X2)
mark(s(X)) → s(mark(X))
mark(0') → 0'
mark(nil) → nil
a__from(X) → from(X)
a__first(X1, X2) → first(X1, X2)
a__sel(X1, X2) → sel(X1, X2)

S is empty.
Rewrite Strategy: FULL

(5) TypeInferenceProof (BOTH BOUNDS(ID, ID) transformation)

Infered types.

(6) Obligation:

TRS:
Rules:
a__from(X) → cons(mark(X), from(s(X)))
a__first(0', Z) → nil
a__first(s(X), cons(Y, Z)) → cons(mark(Y), first(X, Z))
a__sel(0', cons(X, Z)) → mark(X)
a__sel(s(X), cons(Y, Z)) → a__sel(mark(X), mark(Z))
mark(from(X)) → a__from(mark(X))
mark(first(X1, X2)) → a__first(mark(X1), mark(X2))
mark(sel(X1, X2)) → a__sel(mark(X1), mark(X2))
mark(cons(X1, X2)) → cons(mark(X1), X2)
mark(s(X)) → s(mark(X))
mark(0') → 0'
mark(nil) → nil
a__from(X) → from(X)
a__first(X1, X2) → first(X1, X2)
a__sel(X1, X2) → sel(X1, X2)

Types:
a__from :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
cons :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
mark :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
from :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
s :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
a__first :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
0' :: s:from:cons:0':nil:first:sel
nil :: s:from:cons:0':nil:first:sel
first :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
a__sel :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
sel :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
hole_s:from:cons:0':nil:first:sel1_0 :: s:from:cons:0':nil:first:sel
gen_s:from:cons:0':nil:first:sel2_0 :: Nat → s:from:cons:0':nil:first:sel

(7) OrderProof (LOWER BOUND(ID) transformation)

Heuristically decided to analyse the following defined symbols:
a__from, mark, a__sel

They will be analysed ascendingly in the following order:
a__from = mark
a__from = a__sel
mark = a__sel

(8) Obligation:

TRS:
Rules:
a__from(X) → cons(mark(X), from(s(X)))
a__first(0', Z) → nil
a__first(s(X), cons(Y, Z)) → cons(mark(Y), first(X, Z))
a__sel(0', cons(X, Z)) → mark(X)
a__sel(s(X), cons(Y, Z)) → a__sel(mark(X), mark(Z))
mark(from(X)) → a__from(mark(X))
mark(first(X1, X2)) → a__first(mark(X1), mark(X2))
mark(sel(X1, X2)) → a__sel(mark(X1), mark(X2))
mark(cons(X1, X2)) → cons(mark(X1), X2)
mark(s(X)) → s(mark(X))
mark(0') → 0'
mark(nil) → nil
a__from(X) → from(X)
a__first(X1, X2) → first(X1, X2)
a__sel(X1, X2) → sel(X1, X2)

Types:
a__from :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
cons :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
mark :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
from :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
s :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
a__first :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
0' :: s:from:cons:0':nil:first:sel
nil :: s:from:cons:0':nil:first:sel
first :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
a__sel :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
sel :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
hole_s:from:cons:0':nil:first:sel1_0 :: s:from:cons:0':nil:first:sel
gen_s:from:cons:0':nil:first:sel2_0 :: Nat → s:from:cons:0':nil:first:sel

Generator Equations:
gen_s:from:cons:0':nil:first:sel2_0(0) ⇔ 0'
gen_s:from:cons:0':nil:first:sel2_0(+(x, 1)) ⇔ cons(0', gen_s:from:cons:0':nil:first:sel2_0(x))

The following defined symbols remain to be analysed:
mark, a__from, a__sel

They will be analysed ascendingly in the following order:
a__from = mark
a__from = a__sel
mark = a__sel

(9) NoRewriteLemmaProof (LOWER BOUND(ID) transformation)

Could not prove a rewrite lemma for the defined symbol mark.

(10) Obligation:

TRS:
Rules:
a__from(X) → cons(mark(X), from(s(X)))
a__first(0', Z) → nil
a__first(s(X), cons(Y, Z)) → cons(mark(Y), first(X, Z))
a__sel(0', cons(X, Z)) → mark(X)
a__sel(s(X), cons(Y, Z)) → a__sel(mark(X), mark(Z))
mark(from(X)) → a__from(mark(X))
mark(first(X1, X2)) → a__first(mark(X1), mark(X2))
mark(sel(X1, X2)) → a__sel(mark(X1), mark(X2))
mark(cons(X1, X2)) → cons(mark(X1), X2)
mark(s(X)) → s(mark(X))
mark(0') → 0'
mark(nil) → nil
a__from(X) → from(X)
a__first(X1, X2) → first(X1, X2)
a__sel(X1, X2) → sel(X1, X2)

Types:
a__from :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
cons :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
mark :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
from :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
s :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
a__first :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
0' :: s:from:cons:0':nil:first:sel
nil :: s:from:cons:0':nil:first:sel
first :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
a__sel :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
sel :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
hole_s:from:cons:0':nil:first:sel1_0 :: s:from:cons:0':nil:first:sel
gen_s:from:cons:0':nil:first:sel2_0 :: Nat → s:from:cons:0':nil:first:sel

Generator Equations:
gen_s:from:cons:0':nil:first:sel2_0(0) ⇔ 0'
gen_s:from:cons:0':nil:first:sel2_0(+(x, 1)) ⇔ cons(0', gen_s:from:cons:0':nil:first:sel2_0(x))

The following defined symbols remain to be analysed:
a__from, a__sel

They will be analysed ascendingly in the following order:
a__from = mark
a__from = a__sel
mark = a__sel

(11) NoRewriteLemmaProof (LOWER BOUND(ID) transformation)

Could not prove a rewrite lemma for the defined symbol a__from.

(12) Obligation:

TRS:
Rules:
a__from(X) → cons(mark(X), from(s(X)))
a__first(0', Z) → nil
a__first(s(X), cons(Y, Z)) → cons(mark(Y), first(X, Z))
a__sel(0', cons(X, Z)) → mark(X)
a__sel(s(X), cons(Y, Z)) → a__sel(mark(X), mark(Z))
mark(from(X)) → a__from(mark(X))
mark(first(X1, X2)) → a__first(mark(X1), mark(X2))
mark(sel(X1, X2)) → a__sel(mark(X1), mark(X2))
mark(cons(X1, X2)) → cons(mark(X1), X2)
mark(s(X)) → s(mark(X))
mark(0') → 0'
mark(nil) → nil
a__from(X) → from(X)
a__first(X1, X2) → first(X1, X2)
a__sel(X1, X2) → sel(X1, X2)

Types:
a__from :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
cons :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
mark :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
from :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
s :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
a__first :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
0' :: s:from:cons:0':nil:first:sel
nil :: s:from:cons:0':nil:first:sel
first :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
a__sel :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
sel :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
hole_s:from:cons:0':nil:first:sel1_0 :: s:from:cons:0':nil:first:sel
gen_s:from:cons:0':nil:first:sel2_0 :: Nat → s:from:cons:0':nil:first:sel

Generator Equations:
gen_s:from:cons:0':nil:first:sel2_0(0) ⇔ 0'
gen_s:from:cons:0':nil:first:sel2_0(+(x, 1)) ⇔ cons(0', gen_s:from:cons:0':nil:first:sel2_0(x))

The following defined symbols remain to be analysed:
a__sel

They will be analysed ascendingly in the following order:
a__from = mark
a__from = a__sel
mark = a__sel

(13) NoRewriteLemmaProof (LOWER BOUND(ID) transformation)

Could not prove a rewrite lemma for the defined symbol a__sel.

(14) Obligation:

TRS:
Rules:
a__from(X) → cons(mark(X), from(s(X)))
a__first(0', Z) → nil
a__first(s(X), cons(Y, Z)) → cons(mark(Y), first(X, Z))
a__sel(0', cons(X, Z)) → mark(X)
a__sel(s(X), cons(Y, Z)) → a__sel(mark(X), mark(Z))
mark(from(X)) → a__from(mark(X))
mark(first(X1, X2)) → a__first(mark(X1), mark(X2))
mark(sel(X1, X2)) → a__sel(mark(X1), mark(X2))
mark(cons(X1, X2)) → cons(mark(X1), X2)
mark(s(X)) → s(mark(X))
mark(0') → 0'
mark(nil) → nil
a__from(X) → from(X)
a__first(X1, X2) → first(X1, X2)
a__sel(X1, X2) → sel(X1, X2)

Types:
a__from :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
cons :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
mark :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
from :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
s :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
a__first :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
0' :: s:from:cons:0':nil:first:sel
nil :: s:from:cons:0':nil:first:sel
first :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
a__sel :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
sel :: s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel → s:from:cons:0':nil:first:sel
hole_s:from:cons:0':nil:first:sel1_0 :: s:from:cons:0':nil:first:sel
gen_s:from:cons:0':nil:first:sel2_0 :: Nat → s:from:cons:0':nil:first:sel

Generator Equations:
gen_s:from:cons:0':nil:first:sel2_0(0) ⇔ 0'
gen_s:from:cons:0':nil:first:sel2_0(+(x, 1)) ⇔ cons(0', gen_s:from:cons:0':nil:first:sel2_0(x))

No more defined symbols left to analyse.