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:

a(x1) → x1
a(x1) → b(b(c(x1)))
c(c(a(x1))) → a(a(c(c(x1))))

Rewrite Strategy: INNERMOST

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

Converted CpxTRS to CDT

(2) Obligation:

Complexity Dependency Tuples Problem
Rules:

a(z0) → z0
a(z0) → b(b(c(z0)))
c(c(a(z0))) → a(a(c(c(z0))))

Tuples:

A(z0) → c2(C(z0))
C(c(a(z0))) → c3(A(a(c(c(z0)))), A(c(c(z0))), C(c(z0)), C(z0))

S tuples:

A(z0) → c2(C(z0))
C(c(a(z0))) → c3(A(a(c(c(z0)))), A(c(c(z0))), C(c(z0)), C(z0))

K tuples:none
Defined Rule Symbols:

a, c

Defined Pair Symbols:

A, C

Compound Symbols:

c2, c3

(3) CdtUnreachableProof (EQUIVALENT transformation)

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

C(c(a(z0))) → c3(A(a(c(c(z0)))), A(c(c(z0))), C(c(z0)), C(z0))

(4) Obligation:

Complexity Dependency Tuples Problem
Rules:

a(z0) → z0
a(z0) → b(b(c(z0)))
c(c(a(z0))) → a(a(c(c(z0))))

Tuples:

A(z0) → c2(C(z0))

S tuples:

A(z0) → c2(C(z0))

K tuples:none
Defined Rule Symbols:

a, c

Defined Pair Symbols:

A

Compound Symbols:

c2

(5) CdtGraphRemoveDanglingProof (ComplexityIfPolyImplication transformation)

Removed 1 of 1 dangling nodes:

A(z0) → c2(C(z0))

(6) Obligation:

Complexity Dependency Tuples Problem
Rules:

a(z0) → z0
a(z0) → b(b(c(z0)))
c(c(a(z0))) → a(a(c(c(z0))))

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

a, c

Defined Pair Symbols:none

Compound Symbols:none

(7) SIsEmptyProof (EQUIVALENT transformation)

The set S is empty

(8) BOUNDS(O(1), O(1))