On 20/09/16 16:06, Waldek Hebisch wrote:
> You are confused.
It happens!
I have tried the patch and AFAICS it works fine, I would be happy if it
were applied.
> As a face (part of simplical complex) (1,3) and
> (3, 1) are the same face. And problem is not due to wrong
> orientation of input:
I remember now, it is the same face but we allow it to be included
multiple times in different orientations:
(1) -> ASIMP := FiniteSimplicialComplex(VertexSetAbstract)
(1) FiniteSimplicialComplex(VertexSetAbstract)
Type: Type
(2) -> v2a:List(List(NNI)) := [[1,3],[1,3],[3,1]]
(2) [[1,3],[1,3],[3,1]]
Type: List(List(NonNegativeInteger))
(3) -> sc1 := simplicialComplex(vertexSeta(3::NNI),v2a)$ASIMP
(3)
(1,3)
(1,3)
-(1,3)
Type: FiniteSimplicialComplex(VertexSetAbstract)
(4) -> addImpliedFaces(sc1)
(4) [[-(1,3),(1,3),(1,3)]]
Type: List(List(OrientedFacet))
(5) -> sc1::DeltaComplex(VertexSetAbstract)
(5)
1D:[[1,- 2],[1,- 2],[- 1,2]]
Type: DeltaComplex(VertexSetAbstract)
Under a strict geometric interpretation of a definition of
simplicialComplex I suspect that this should not be allowed? But, as we
discussed earlier, it is useful not to prevent this to allow
construction of interesting delta complexes.
> - apparently you want chains here. Chains are not the same as
> complexes.
I take your point and I would like to pursue your earlier comments about
having a separate chain domain (though I'm not sure exactly how).
Martin B
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