(0) Obligation:
Q restricted rewrite system:
The TRS R consists of the following rules:
le(0, y) → true
le(s(x), 0) → false
le(s(x), s(y)) → le(x, y)
mod(x, 0) → modZeroErro
mod(x, s(y)) → modIter(x, s(y), 0, 0)
modIter(x, s(y), z, u) → if(le(x, z), x, s(y), z, u)
if(true, x, y, z, u) → u
if(false, x, y, z, u) → if2(le(y, s(u)), x, y, s(z), s(u))
if2(false, x, y, z, u) → modIter(x, y, z, u)
if2(true, x, y, z, u) → modIter(x, y, z, 0)
Q is empty.
(1) Overlay + Local Confluence (EQUIVALENT transformation)
The TRS is overlay and locally confluent. By [NOC] we can switch to innermost.
(2) Obligation:
Q restricted rewrite system:
The TRS R consists of the following rules:
le(0, y) → true
le(s(x), 0) → false
le(s(x), s(y)) → le(x, y)
mod(x, 0) → modZeroErro
mod(x, s(y)) → modIter(x, s(y), 0, 0)
modIter(x, s(y), z, u) → if(le(x, z), x, s(y), z, u)
if(true, x, y, z, u) → u
if(false, x, y, z, u) → if2(le(y, s(u)), x, y, s(z), s(u))
if2(false, x, y, z, u) → modIter(x, y, z, u)
if2(true, x, y, z, u) → modIter(x, y, z, 0)
The set Q consists of the following terms:
le(0, x0)
le(s(x0), 0)
le(s(x0), s(x1))
mod(x0, 0)
mod(x0, s(x1))
modIter(x0, s(x1), x2, x3)
if(true, x0, x1, x2, x3)
if(false, x0, x1, x2, x3)
if2(false, x0, x1, x2, x3)
if2(true, x0, x1, x2, x3)
(3) DependencyPairsProof (EQUIVALENT transformation)
Using Dependency Pairs [AG00,LPAR04] we result in the following initial DP problem.
(4) Obligation:
Q DP problem:
The TRS P consists of the following rules:
LE(s(x), s(y)) → LE(x, y)
MOD(x, s(y)) → MODITER(x, s(y), 0, 0)
MODITER(x, s(y), z, u) → IF(le(x, z), x, s(y), z, u)
MODITER(x, s(y), z, u) → LE(x, z)
IF(false, x, y, z, u) → IF2(le(y, s(u)), x, y, s(z), s(u))
IF(false, x, y, z, u) → LE(y, s(u))
IF2(false, x, y, z, u) → MODITER(x, y, z, u)
IF2(true, x, y, z, u) → MODITER(x, y, z, 0)
The TRS R consists of the following rules:
le(0, y) → true
le(s(x), 0) → false
le(s(x), s(y)) → le(x, y)
mod(x, 0) → modZeroErro
mod(x, s(y)) → modIter(x, s(y), 0, 0)
modIter(x, s(y), z, u) → if(le(x, z), x, s(y), z, u)
if(true, x, y, z, u) → u
if(false, x, y, z, u) → if2(le(y, s(u)), x, y, s(z), s(u))
if2(false, x, y, z, u) → modIter(x, y, z, u)
if2(true, x, y, z, u) → modIter(x, y, z, 0)
The set Q consists of the following terms:
le(0, x0)
le(s(x0), 0)
le(s(x0), s(x1))
mod(x0, 0)
mod(x0, s(x1))
modIter(x0, s(x1), x2, x3)
if(true, x0, x1, x2, x3)
if(false, x0, x1, x2, x3)
if2(false, x0, x1, x2, x3)
if2(true, x0, x1, x2, x3)
We have to consider all minimal (P,Q,R)-chains.
(5) DependencyGraphProof (EQUIVALENT transformation)
The approximation of the Dependency Graph [LPAR04,FROCOS05,EDGSTAR] contains 2 SCCs with 3 less nodes.
(6) Complex Obligation (AND)
(7) Obligation:
Q DP problem:
The TRS P consists of the following rules:
LE(s(x), s(y)) → LE(x, y)
The TRS R consists of the following rules:
le(0, y) → true
le(s(x), 0) → false
le(s(x), s(y)) → le(x, y)
mod(x, 0) → modZeroErro
mod(x, s(y)) → modIter(x, s(y), 0, 0)
modIter(x, s(y), z, u) → if(le(x, z), x, s(y), z, u)
if(true, x, y, z, u) → u
if(false, x, y, z, u) → if2(le(y, s(u)), x, y, s(z), s(u))
if2(false, x, y, z, u) → modIter(x, y, z, u)
if2(true, x, y, z, u) → modIter(x, y, z, 0)
The set Q consists of the following terms:
le(0, x0)
le(s(x0), 0)
le(s(x0), s(x1))
mod(x0, 0)
mod(x0, s(x1))
modIter(x0, s(x1), x2, x3)
if(true, x0, x1, x2, x3)
if(false, x0, x1, x2, x3)
if2(false, x0, x1, x2, x3)
if2(true, x0, x1, x2, x3)
We have to consider all minimal (P,Q,R)-chains.
(8) Obligation:
Q DP problem:
The TRS P consists of the following rules:
MODITER(x, s(y), z, u) → IF(le(x, z), x, s(y), z, u)
IF(false, x, y, z, u) → IF2(le(y, s(u)), x, y, s(z), s(u))
IF2(false, x, y, z, u) → MODITER(x, y, z, u)
IF2(true, x, y, z, u) → MODITER(x, y, z, 0)
The TRS R consists of the following rules:
le(0, y) → true
le(s(x), 0) → false
le(s(x), s(y)) → le(x, y)
mod(x, 0) → modZeroErro
mod(x, s(y)) → modIter(x, s(y), 0, 0)
modIter(x, s(y), z, u) → if(le(x, z), x, s(y), z, u)
if(true, x, y, z, u) → u
if(false, x, y, z, u) → if2(le(y, s(u)), x, y, s(z), s(u))
if2(false, x, y, z, u) → modIter(x, y, z, u)
if2(true, x, y, z, u) → modIter(x, y, z, 0)
The set Q consists of the following terms:
le(0, x0)
le(s(x0), 0)
le(s(x0), s(x1))
mod(x0, 0)
mod(x0, s(x1))
modIter(x0, s(x1), x2, x3)
if(true, x0, x1, x2, x3)
if(false, x0, x1, x2, x3)
if2(false, x0, x1, x2, x3)
if2(true, x0, x1, x2, x3)
We have to consider all minimal (P,Q,R)-chains.