The Runtime Complexity (full) of the given CpxTRS could be proven to be BOUNDS(1, n^1).

(0) Obligation:

The Runtime Complexity (full) of the given CpxTRS could be proven to be BOUNDS(1, n^1).


The TRS R consists of the following rules:

-(0, y) → 0
-(x, 0) → x
-(x, s(y)) → if(greater(x, s(y)), s(-(x, p(s(y)))), 0)
p(0) → 0
p(s(x)) → x

Rewrite Strategy: FULL

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

Converted rc-obligation to irc-obligation.

The duplicating contexts are:
-([], s(y))
-(x, s([]))

The defined contexts are:
-(x0, [])
p(s([]))

[] just represents basic- or constructor-terms in the following defined contexts:
-(x0, [])

As the TRS is an overlay system and the defined contexts and the duplicating contexts don't overlap, we have rc = irc.

(2) Obligation:

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


The TRS R consists of the following rules:

-(0, y) → 0
-(x, 0) → x
-(x, s(y)) → if(greater(x, s(y)), s(-(x, p(s(y)))), 0)
p(0) → 0
p(s(x)) → x

Rewrite Strategy: INNERMOST

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

Converted Cpx (relative) TRS to CDT

(4) Obligation:

Complexity Dependency Tuples Problem
Rules:

-(0, z0) → 0
-(z0, 0) → z0
-(z0, s(z1)) → if(greater(z0, s(z1)), s(-(z0, p(s(z1)))), 0)
p(0) → 0
p(s(z0)) → z0

Tuples:

-'(0, z0) → c
-'(z0, 0) → c1
-'(z0, s(z1)) → c2(-'(z0, p(s(z1))), P(s(z1)))
P(0) → c3
P(s(z0)) → c4

S tuples:

-'(0, z0) → c
-'(z0, 0) → c1
-'(z0, s(z1)) → c2(-'(z0, p(s(z1))), P(s(z1)))
P(0) → c3
P(s(z0)) → c4

K tuples:none
Defined Rule Symbols:

-, p

Defined Pair Symbols:

-', P

Compound Symbols:

c, c1, c2, c3, c4

(5) CdtLeafRemovalProof (BOTH BOUNDS(ID, ID) transformation)

Removed 4 trailing nodes:

-'(0, z0) → c
-'(z0, 0) → c1
P(s(z0)) → c4
P(0) → c3

(6) Obligation:

Complexity Dependency Tuples Problem
Rules:

-(0, z0) → 0
-(z0, 0) → z0
-(z0, s(z1)) → if(greater(z0, s(z1)), s(-(z0, p(s(z1)))), 0)
p(0) → 0
p(s(z0)) → z0

Tuples:

-'(z0, s(z1)) → c2(-'(z0, p(s(z1))), P(s(z1)))

S tuples:

-'(z0, s(z1)) → c2(-'(z0, p(s(z1))), P(s(z1)))

K tuples:none
Defined Rule Symbols:

-, p

Defined Pair Symbols:

-'

Compound Symbols:

c2

(7) CdtRhsSimplificationProcessorProof (BOTH BOUNDS(ID, ID) transformation)

Removed 1 trailing tuple parts

(8) Obligation:

Complexity Dependency Tuples Problem
Rules:

-(0, z0) → 0
-(z0, 0) → z0
-(z0, s(z1)) → if(greater(z0, s(z1)), s(-(z0, p(s(z1)))), 0)
p(0) → 0
p(s(z0)) → z0

Tuples:

-'(z0, s(z1)) → c2(-'(z0, p(s(z1))))

S tuples:

-'(z0, s(z1)) → c2(-'(z0, p(s(z1))))

K tuples:none
Defined Rule Symbols:

-, p

Defined Pair Symbols:

-'

Compound Symbols:

c2

(9) CdtUsableRulesProof (EQUIVALENT transformation)

The following rules are not usable and were removed:

-(0, z0) → 0
-(z0, 0) → z0
-(z0, s(z1)) → if(greater(z0, s(z1)), s(-(z0, p(s(z1)))), 0)
p(0) → 0

(10) Obligation:

Complexity Dependency Tuples Problem
Rules:

p(s(z0)) → z0

Tuples:

-'(z0, s(z1)) → c2(-'(z0, p(s(z1))))

S tuples:

-'(z0, s(z1)) → c2(-'(z0, p(s(z1))))

K tuples:none
Defined Rule Symbols:

p

Defined Pair Symbols:

-'

Compound Symbols:

c2

(11) CdtNarrowingProof (BOTH BOUNDS(ID, ID) transformation)

Use narrowing to replace -'(z0, s(z1)) → c2(-'(z0, p(s(z1)))) by

-'(x0, s(z0)) → c2(-'(x0, z0))

(12) Obligation:

Complexity Dependency Tuples Problem
Rules:

p(s(z0)) → z0

Tuples:

-'(x0, s(z0)) → c2(-'(x0, z0))

S tuples:

-'(x0, s(z0)) → c2(-'(x0, z0))

K tuples:none
Defined Rule Symbols:

p

Defined Pair Symbols:

-'

Compound Symbols:

c2

(13) CdtUsableRulesProof (EQUIVALENT transformation)

The following rules are not usable and were removed:

p(s(z0)) → z0

(14) Obligation:

Complexity Dependency Tuples Problem
Rules:none
Tuples:

-'(x0, s(z0)) → c2(-'(x0, z0))

S tuples:

-'(x0, s(z0)) → c2(-'(x0, z0))

K tuples:none
Defined Rule Symbols:none

Defined Pair Symbols:

-'

Compound Symbols:

c2

(15) CdtRuleRemovalProof (UPPER BOUND(ADD(n^1)) transformation)

Found a reduction pair which oriented the following tuples strictly. Hence they can be removed from S.

-'(x0, s(z0)) → c2(-'(x0, z0))

We considered the (Usable) Rules:none
And the Tuples:

-'(x0, s(z0)) → c2(-'(x0, z0))

The order we found is given by the following interpretation:
Polynomial interpretation :

POL(-'(x₁, x₂)) = x₂   
POL(c2(x₁)) = x₁   
POL(s(x₁)) = [1] + x₁   

(16) Obligation:

Complexity Dependency Tuples Problem
Rules:none
Tuples:

-'(x0, s(z0)) → c2(-'(x0, z0))

S tuples:none
K tuples:

-'(x0, s(z0)) → c2(-'(x0, z0))

Defined Rule Symbols:none

Defined Pair Symbols:

-'

Compound Symbols:

c2

(17) SIsEmptyProof (BOTH BOUNDS(ID, ID) transformation)

The set S is empty

(18) BOUNDS(1, 1)