On Thu, 28 Aug 2014, Nathann Cohen wrote:
Now it seems to work! I'll continue testing, and add a function to
sage.
It is meant to be equivalent, so it would be a bad news if they did not
give the same answer :-P
As a side note of testing: Docs for is_modular() reference to the
wikipedia article saying "Every non-modular lattice contains a copy of N5
as a sublattice." However
LatticePoset(Poset( ([0,1,2,3,4,5], [[0, 1], [0, 3], [1, 2], [1, 4], [2, 5],
[3, 4], [4, 5]]) )).is_modular()
returns True. Is this an error on Sage, or have I understood something
wrong?
--
Jori Mäntysalo
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