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:

eq0(S(x'), S(x)) → eq0(x', x)
eq0(S(x), 0) → 0
eq0(0, S(x)) → 0
eq0(0, 0) → S(0)

Rewrite Strategy: INNERMOST

(1) DecreasingLoopProof (EQUIVALENT transformation)

The following loop(s) give(s) rise to the lower bound Ω(n¹):
The rewrite sequence
eq0(S(x'), S(x)) →⁺ eq0(x', x)
gives rise to a decreasing loop by considering the right hand sides subterm at position [].
The pumping substitution is [x' / S(x'), x / S(x)].
The result substitution is [ ].

(2) BOUNDS(n^1, INF)