a(a(f(

f(a(

f(b(

R

↳Dependency Pair Analysis

A(a(f(x,y))) -> F(a(b(a(b(a(x))))), a(b(a(b(a(y))))))

A(a(f(x,y))) -> A(b(a(b(a(x)))))

A(a(f(x,y))) -> A(b(a(x)))

A(a(f(x,y))) -> A(x)

A(a(f(x,y))) -> A(b(a(b(a(y)))))

A(a(f(x,y))) -> A(b(a(y)))

A(a(f(x,y))) -> A(y)

F(a(x), a(y)) -> A(f(x,y))

F(a(x), a(y)) -> F(x,y)

F(b(x), b(y)) -> F(x,y)

Furthermore,

R

↳DPs

→DP Problem 1

↳Narrowing Transformation

**F(b( x), b(y)) -> F(x, y)**

a(a(f(x,y))) -> f(a(b(a(b(a(x))))), a(b(a(b(a(y))))))

f(a(x), a(y)) -> a(f(x,y))

f(b(x), b(y)) -> b(f(x,y))

On this DP problem, a Narrowing SCC transformation can be performed.

As a result of transforming the rule

two new Dependency Pairs are created:

F(a(x), a(y)) -> A(f(x,y))

F(a(a(x'')), a(a(y''))) -> A(a(f(x'',y'')))

F(a(b(x'')), a(b(y''))) -> A(b(f(x'',y'')))

The transformation is resulting in one new DP problem:

R

↳DPs

→DP Problem 1

↳Nar

→DP Problem 2

↳Polynomial Ordering

**A(a(f( x, y))) -> A(y)**

a(a(f(x,y))) -> f(a(b(a(b(a(x))))), a(b(a(b(a(y))))))

f(a(x), a(y)) -> a(f(x,y))

f(b(x), b(y)) -> b(f(x,y))

The following dependency pairs can be strictly oriented:

A(a(f(x,y))) -> A(y)

A(a(f(x,y))) -> A(x)

Additionally, the following usable rules w.r.t. to the implicit AFS can be oriented:

a(a(f(x,y))) -> f(a(b(a(b(a(x))))), a(b(a(b(a(y))))))

f(a(x), a(y)) -> a(f(x,y))

f(b(x), b(y)) -> b(f(x,y))

Used ordering: Polynomial ordering with Polynomial interpretation:

_{ }^{ }POL(b(x)_{1})= x _{1}_{ }^{ }_{ }^{ }POL(a(x)_{1})= x _{1}_{ }^{ }_{ }^{ }POL(f(x)_{1}, x_{2})= 1 + x _{1}+ x_{2}_{ }^{ }_{ }^{ }POL(A(x)_{1})= x _{1}_{ }^{ }_{ }^{ }POL(F(x)_{1}, x_{2})= 1 + x _{1}+ x_{2}_{ }^{ }

resulting in one new DP problem.

R

↳DPs

→DP Problem 1

↳Nar

→DP Problem 2

↳Polo

...

→DP Problem 3

↳Remaining Obligation(s)

The following remains to be proven:

**A(a(f( x, y))) -> F(a(b(a(b(a(x))))), a(b(a(b(a(y))))))**

a(a(f(x,y))) -> f(a(b(a(b(a(x))))), a(b(a(b(a(y))))))

f(a(x), a(y)) -> a(f(x,y))

f(b(x), b(y)) -> b(f(x,y))

Duration:

0:00 minutes