* Step 1: DependencyPairs WORST_CASE(?,O(n^1))
+ Considered Problem:
- Strict TRS:
f(x,y,s(z)) -> s(f(0(),1(),z))
f(0(),1(),x) -> f(s(x),x,x)
- Signature:
{f/3} / {0/0,1/0,s/1}
- Obligation:
runtime complexity wrt. defined symbols {f} and constructors {0,1,s}
+ Applied Processor:
DependencyPairs {dpKind_ = WIDP}
+ Details:
We add the following weak dependency pairs:
Strict DPs
f#(x,y,s(z)) -> c_1(f#(0(),1(),z))
f#(0(),1(),x) -> c_2(f#(s(x),x,x))
Weak DPs
and mark the set of starting terms.
* Step 2: UsableRules WORST_CASE(?,O(n^1))
+ Considered Problem:
- Strict DPs:
f#(x,y,s(z)) -> c_1(f#(0(),1(),z))
f#(0(),1(),x) -> c_2(f#(s(x),x,x))
- Strict TRS:
f(x,y,s(z)) -> s(f(0(),1(),z))
f(0(),1(),x) -> f(s(x),x,x)
- Signature:
{f/3,f#/3} / {0/0,1/0,s/1,c_1/1,c_2/1}
- Obligation:
runtime complexity wrt. defined symbols {f#} and constructors {0,1,s}
+ Applied Processor:
UsableRules
+ Details:
We replace rewrite rules by usable rules:
f#(x,y,s(z)) -> c_1(f#(0(),1(),z))
f#(0(),1(),x) -> c_2(f#(s(x),x,x))
* Step 3: PredecessorEstimationCP WORST_CASE(?,O(n^1))
+ Considered Problem:
- Strict DPs:
f#(x,y,s(z)) -> c_1(f#(0(),1(),z))
f#(0(),1(),x) -> c_2(f#(s(x),x,x))
- Signature:
{f/3,f#/3} / {0/0,1/0,s/1,c_1/1,c_2/1}
- Obligation:
runtime complexity wrt. defined symbols {f#} and constructors {0,1,s}
+ Applied Processor:
PredecessorEstimationCP {onSelectionCP = any intersect of rules of CDG leaf and strict-rules, withComplexityPair = NaturalMI {miDimension = 1, miDegree = 1, miKind = Algebraic, uargs = UArgs, urules = URules, selector = Nothing}}
+ Details:
We first use the processor NaturalMI {miDimension = 1, miDegree = 1, miKind = Algebraic, uargs = UArgs, urules = URules, selector = Nothing} to orient following rules strictly:
1: f#(x,y,s(z)) -> c_1(f#(0(),1(),z))
Consider the set of all dependency pairs
1: f#(x,y,s(z)) -> c_1(f#(0(),1(),z))
2: f#(0(),1(),x) -> c_2(f#(s(x),x,x))
Processor NaturalMI {miDimension = 1, miDegree = 1, miKind = Algebraic, uargs = UArgs, urules = URules, selector = Nothing}induces the complexity certificateTIME (?,O(n^1))
SPACE(?,?)on application of the dependency pairs
{1}
These cover all (indirect) predecessors of dependency pairs
{1,2}
their number of applications is equally bounded.
The dependency pairs are shifted into the weak component.
** Step 3.a:1: NaturalMI WORST_CASE(?,O(n^1))
+ Considered Problem:
- Strict DPs:
f#(x,y,s(z)) -> c_1(f#(0(),1(),z))
f#(0(),1(),x) -> c_2(f#(s(x),x,x))
- Signature:
{f/3,f#/3} / {0/0,1/0,s/1,c_1/1,c_2/1}
- Obligation:
runtime complexity wrt. defined symbols {f#} and constructors {0,1,s}
+ Applied Processor:
NaturalMI {miDimension = 1, miDegree = 1, miKind = Algebraic, uargs = UArgs, urules = URules, selector = Just first alternative for predecessorEstimation on any intersect of rules of CDG leaf and strict-rules}
+ Details:
We apply a matrix interpretation of kind constructor based matrix interpretation:
The following argument positions are considered usable:
uargs(c_1) = {1},
uargs(c_2) = {1}
Following symbols are considered usable:
all
TcT has computed the following interpretation:
p(0) = [0]
p(1) = [1]
p(f) = [1] x2 + [1] x3 + [2]
p(s) = [1] x1 + [4]
p(f#) = [4] x3 + [0]
p(c_1) = [1] x1 + [15]
p(c_2) = [1] x1 + [0]
Following rules are strictly oriented:
f#(x,y,s(z)) = [4] z + [16]
> [4] z + [15]
= c_1(f#(0(),1(),z))
Following rules are (at-least) weakly oriented:
f#(0(),1(),x) = [4] x + [0]
>= [4] x + [0]
= c_2(f#(s(x),x,x))
** Step 3.a:2: Assumption WORST_CASE(?,O(1))
+ Considered Problem:
- Strict DPs:
f#(0(),1(),x) -> c_2(f#(s(x),x,x))
- Weak DPs:
f#(x,y,s(z)) -> c_1(f#(0(),1(),z))
- Signature:
{f/3,f#/3} / {0/0,1/0,s/1,c_1/1,c_2/1}
- Obligation:
runtime complexity wrt. defined symbols {f#} and constructors {0,1,s}
+ Applied Processor:
Assumption {assumed = Certificate {spaceUB = Unknown, spaceLB = Unknown, timeUB = Poly (Just 0), timeLB = Unknown}}
+ Details:
()
** Step 3.b:1: RemoveWeakSuffixes WORST_CASE(?,O(1))
+ Considered Problem:
- Weak DPs:
f#(x,y,s(z)) -> c_1(f#(0(),1(),z))
f#(0(),1(),x) -> c_2(f#(s(x),x,x))
- Signature:
{f/3,f#/3} / {0/0,1/0,s/1,c_1/1,c_2/1}
- Obligation:
runtime complexity wrt. defined symbols {f#} and constructors {0,1,s}
+ Applied Processor:
RemoveWeakSuffixes
+ Details:
Consider the dependency graph
1:W:f#(x,y,s(z)) -> c_1(f#(0(),1(),z))
-->_1 f#(0(),1(),x) -> c_2(f#(s(x),x,x)):2
-->_1 f#(x,y,s(z)) -> c_1(f#(0(),1(),z)):1
2:W:f#(0(),1(),x) -> c_2(f#(s(x),x,x))
-->_1 f#(x,y,s(z)) -> c_1(f#(0(),1(),z)):1
The following weak DPs constitute a sub-graph of the DG that is closed under successors. The DPs are removed.
1: f#(x,y,s(z)) -> c_1(f#(0(),1(),z))
2: f#(0(),1(),x) -> c_2(f#(s(x),x,x))
** Step 3.b:2: EmptyProcessor WORST_CASE(?,O(1))
+ Considered Problem:
- Signature:
{f/3,f#/3} / {0/0,1/0,s/1,c_1/1,c_2/1}
- Obligation:
runtime complexity wrt. defined symbols {f#} and constructors {0,1,s}
+ Applied Processor:
EmptyProcessor
+ Details:
The problem is already closed. The intended complexity is O(1).
WORST_CASE(?,O(n^1))