The Runtime Complexity (innermost) of the given CpxTRS could be proven to be BOUNDS(n^1, INF).

(0) Obligation:

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

f(0, y) → 0
f(s(x), y) → f(f(x, y), y)

Rewrite Strategy: INNERMOST

(1) RenamingProof (EQUIVALENT transformation)

Renamed function symbols to avoid clashes with predefined symbol.

(2) Obligation:

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

f(0', y) → 0'
f(s(x), y) → f(f(x, y), y)

S is empty.
Rewrite Strategy: INNERMOST

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

Infered types.

(4) Obligation:

Innermost TRS:
Rules:
f(0', y) → 0'
f(s(x), y) → f(f(x, y), y)

Types:
f :: 0':s → a → 0':s
0' :: 0':s
s :: 0':s → 0':s
hole_0':s1_0 :: 0':s
hole_a2_0 :: a
gen_0':s3_0 :: Nat → 0':s

(5) OrderProof (LOWER BOUND(ID) transformation)

Heuristically decided to analyse the following defined symbols:
f

(6) Obligation:

Innermost TRS:
Rules:
f(0', y) → 0'
f(s(x), y) → f(f(x, y), y)

Types:
f :: 0':s → a → 0':s
0' :: 0':s
s :: 0':s → 0':s
hole_0':s1_0 :: 0':s
hole_a2_0 :: a
gen_0':s3_0 :: Nat → 0':s

Generator Equations:
gen_0':s3_0(0) ⇔ 0'
gen_0':s3_0(+(x, 1)) ⇔ s(gen_0':s3_0(x))

The following defined symbols remain to be analysed:
f

(7) RewriteLemmaProof (LOWER BOUND(ID) transformation)

Proved the following rewrite lemma:
f(gen_0':s3_0(n5_0), hole_a2_0) → gen_0':s3_0(0), rt ∈ Ω(1 + n5₀)

Induction Base:
f(gen_0':s3_0(0), hole_a2_0) →_R^Ω(1)
0'

Induction Step:
f(gen_0':s3_0(+(n5_0, 1)), hole_a2_0) →_R^Ω(1)
f(f(gen_0':s3_0(n5_0), hole_a2_0), hole_a2_0) →_IH
f(gen_0':s3_0(0), hole_a2_0) →_R^Ω(1)
0'

We have rt ∈ Ω(n¹) and sz ∈ O(n). Thus, we have irc_R ∈ Ω(n).

(8) Complex Obligation (BEST)

(9) Obligation:

Innermost TRS:
Rules:
f(0', y) → 0'
f(s(x), y) → f(f(x, y), y)

Types:
f :: 0':s → a → 0':s
0' :: 0':s
s :: 0':s → 0':s
hole_0':s1_0 :: 0':s
hole_a2_0 :: a
gen_0':s3_0 :: Nat → 0':s

Lemmas:
f(gen_0':s3_0(n5_0), hole_a2_0) → gen_0':s3_0(0), rt ∈ Ω(1 + n5₀)

Generator Equations:
gen_0':s3_0(0) ⇔ 0'
gen_0':s3_0(+(x, 1)) ⇔ s(gen_0':s3_0(x))

No more defined symbols left to analyse.

(10) LowerBoundsProof (EQUIVALENT transformation)

The lowerbound Ω(n¹) was proven with the following lemma:
f(gen_0':s3_0(n5_0), hole_a2_0) → gen_0':s3_0(0), rt ∈ Ω(1 + n5₀)

(11) BOUNDS(n^1, INF)

(12) Obligation:

Innermost TRS:
Rules:
f(0', y) → 0'
f(s(x), y) → f(f(x, y), y)

Types:
f :: 0':s → a → 0':s
0' :: 0':s
s :: 0':s → 0':s
hole_0':s1_0 :: 0':s
hole_a2_0 :: a
gen_0':s3_0 :: Nat → 0':s

Lemmas:
f(gen_0':s3_0(n5_0), hole_a2_0) → gen_0':s3_0(0), rt ∈ Ω(1 + n5₀)

Generator Equations:
gen_0':s3_0(0) ⇔ 0'
gen_0':s3_0(+(x, 1)) ⇔ s(gen_0':s3_0(x))

No more defined symbols left to analyse.

(13) LowerBoundsProof (EQUIVALENT transformation)

The lowerbound Ω(n¹) was proven with the following lemma:
f(gen_0':s3_0(n5_0), hole_a2_0) → gen_0':s3_0(0), rt ∈ Ω(1 + n5₀)

(14) BOUNDS(n^1, INF)