Any comments on this?
Graphs have vertices and edges, posets have elements and relations. This is of course mirrored to function names, like .cover_relations() instead of .edges(). Should we mirror that to parameter names in plot() and show() also?
I did that, see https://trac.sagemath.org/ticket/18545 , but now I am unsure after a comment from Kevin.
-- Jori Mäntysalo
