1) Why is join() defined for join-semilattices, but join_matrix() "defined" for posets? (I.e. it works by giving exception if the poset is not join-semilattice.)

2) Would it be useful to have join() function taking more than two arguments? And if so, should then also L.join(x) return x if x in L, and maybe even L.join() return L.top()? Or could join take a list as argument, so that both L.join(x,y) and L.join([x,y]) would work and latter one be possible to extend to L.join([x,y,z,...])?

3) s/join/meet for questions 1 and 2.

--
Jori Mäntysalo

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