On Thu, 3 Apr 2014, John Cremona wrote:
There are different objects all called lattices in different contexts. Let's start by acknowledging that we are not talking about some kind of poset -- though there will be others for whom that is what the word "lattice" means.
Then what word should be used for special kind of poset? There is already is_join_semilattice() and is_meet_semilattice() on class Poset.
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