On Thu, 2 Oct 2014, Francesco Biscani wrote:
Thanks for the other pointers as well.
At Tampere we used Sage to study singularity of lcm-matrices of gcd-closed
sets. With Sage it is very easy to show divisor semilattice of such a set.
On the other direction we generated all lattices of given size on set
var('a'), var('b')..., discard some of them for some known property, then
make a polynomial of those variables and möbius function values of
lattice.
I have no idea if this would have been easy with some other software.
With next release of Sage this will be still easier, thanks to .width()
and other additions to posets.
--
Jori Mäntysalo
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