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

(0) Obligation:

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

f(f(f(f(j, a), b), c), d) → f(f(a, b), f(f(a, d), c))

Rewrite Strategy: INNERMOST

(1) CpxTrsToCdtProof (BOTH BOUNDS(ID, ID) transformation)

Converted CpxTRS to CDT

(2) Obligation:

Complexity Dependency Tuples Problem
Rules:

f(f(f(f(j, z0), z1), z2), z3) → f(f(z0, z1), f(f(z0, z3), z2))

Tuples:

F(f(f(f(j, z0), z1), z2), z3) → c(F(f(z0, z1), f(f(z0, z3), z2)), F(z0, z1), F(f(z0, z3), z2), F(z0, z3))

S tuples:

F(f(f(f(j, z0), z1), z2), z3) → c(F(f(z0, z1), f(f(z0, z3), z2)), F(z0, z1), F(f(z0, z3), z2), F(z0, z3))

K tuples:none
Defined Rule Symbols:

f

Defined Pair Symbols:

F

Compound Symbols:

c

(3) CdtUnreachableProof (EQUIVALENT transformation)

The following tuples could be removed as they are not reachable from basic start terms:

F(f(f(f(j, z0), z1), z2), z3) → c(F(f(z0, z1), f(f(z0, z3), z2)), F(z0, z1), F(f(z0, z3), z2), F(z0, z3))

(4) Obligation:

Complexity Dependency Tuples Problem
Rules:

f(f(f(f(j, z0), z1), z2), z3) → f(f(z0, z1), f(f(z0, z3), z2))

Tuples:none
S tuples:none
K tuples:none
Defined Rule Symbols:

f

Defined Pair Symbols:none

Compound Symbols:none

(5) SIsEmptyProof (EQUIVALENT transformation)

The set S is empty

(6) BOUNDS(O(1), O(1))