The following code gives incorrect result.
I create simplicial complex Z.
Z = SimplicialComplex([[0,1,2,3]]);Z
Simplicial complex with vertex set (0, 1, 2, 3) and facets {(0, 1, 2, 3)}
It has correct faces:
Z.faces()
{0: set([(3,), (0,), (1,), (2,)]), 1: set([(2, 3), (0, 2), (1, 3), (1, 2), (0,
3), (0, 1)]), 2: set([(0, 2, 3), (0, 1, 2), (1, 2, 3), (0, 1, 3)]), 3: set([(0,
1, 2, 3)]), -1: set([()])}
X1=Z.remove_face([(0,1)]);X1
Simplicial complex with vertex set (0, 1, 2, 3) and facets {(0, 1, 2, 3)}
X1.faces()
{0: set([(3,), (0,), (1,), (2,)]), 1: set([(2, 3), (0, 2), (1, 3), (1, 2), (0,
3), (0, 1)]), 2: set([(0, 2, 3), (0, 1, 2), (1, 2, 3), (0, 1, 3)]), 3: set([(0,
1, 2, 3)]), -1: set([()])}
After face removal it is still there.
It was very old bug in Sage 5.6
My code doesn work correctly both in my Sage 6.8 and in Cocalc Internet
platform:
https://cocalc.com/share/52e64765-ec22-4637-9821-6528d33ab85e/2018-02-10-220535.sagews?viewer=share
Best Regards
Kazek Kurz
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