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:

h(f(x, y)) → f(y, f(h(h(x)), a))

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:

h(f(x, y)) → f(y, f(h(h(x)), a))

S is empty.
Rewrite Strategy: INNERMOST

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

Infered types.

(4) Obligation:

Innermost TRS:
Rules:
h(f(x, y)) → f(y, f(h(h(x)), a))

Types:
h :: f:a → f:a
f :: f:a → f:a → f:a
a :: f:a
hole_f:a1_0 :: f:a
gen_f:a2_0 :: Nat → f:a

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

Heuristically decided to analyse the following defined symbols:
h

(6) Obligation:

Innermost TRS:
Rules:
h(f(x, y)) → f(y, f(h(h(x)), a))

Types:
h :: f:a → f:a
f :: f:a → f:a → f:a
a :: f:a
hole_f:a1_0 :: f:a
gen_f:a2_0 :: Nat → f:a

Generator Equations:
gen_f:a2_0(0) ⇔ a
gen_f:a2_0(+(x, 1)) ⇔ f(gen_f:a2_0(x), a)

The following defined symbols remain to be analysed:
h

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

Proved the following rewrite lemma:
h(gen_f:a2_0(+(1, n4_0))) → *3_0, rt ∈ Ω(n4₀)

Induction Base:
h(gen_f:a2_0(+(1, 0)))

Induction Step:
h(gen_f:a2_0(+(1, +(n4_0, 1)))) →_R^Ω(1)
f(a, f(h(h(gen_f:a2_0(+(1, n4_0)))), a)) →_IH
f(a, f(h(*3_0), a))

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:
h(f(x, y)) → f(y, f(h(h(x)), a))

Types:
h :: f:a → f:a
f :: f:a → f:a → f:a
a :: f:a
hole_f:a1_0 :: f:a
gen_f:a2_0 :: Nat → f:a

Lemmas:
h(gen_f:a2_0(+(1, n4_0))) → *3_0, rt ∈ Ω(n4₀)

Generator Equations:
gen_f:a2_0(0) ⇔ a
gen_f:a2_0(+(x, 1)) ⇔ f(gen_f:a2_0(x), a)

No more defined symbols left to analyse.

(10) LowerBoundsProof (EQUIVALENT transformation)

The lowerbound Ω(n¹) was proven with the following lemma:
h(gen_f:a2_0(+(1, n4_0))) → *3_0, rt ∈ Ω(n4₀)

(11) BOUNDS(n^1, INF)

(12) Obligation:

Innermost TRS:
Rules:
h(f(x, y)) → f(y, f(h(h(x)), a))

Types:
h :: f:a → f:a
f :: f:a → f:a → f:a
a :: f:a
hole_f:a1_0 :: f:a
gen_f:a2_0 :: Nat → f:a

Lemmas:
h(gen_f:a2_0(+(1, n4_0))) → *3_0, rt ∈ Ω(n4₀)

Generator Equations:
gen_f:a2_0(0) ⇔ a
gen_f:a2_0(+(x, 1)) ⇔ f(gen_f:a2_0(x), a)

No more defined symbols left to analyse.

(13) LowerBoundsProof (EQUIVALENT transformation)

The lowerbound Ω(n¹) was proven with the following lemma:
h(gen_f:a2_0(+(1, n4_0))) → *3_0, rt ∈ Ω(n4₀)

(14) BOUNDS(n^1, INF)