davyK wrote:it only works if b^2 > 4ac though, otherwise you get into complex number world.
acemuzzy wrote:Neither of those is really a "maths" term. I think I'd view them differently, but would say there's a trivial mapping of one to the other (i.e. set of children = set of contained sets). A hierarchy has an implied ordering, where as sets don't (you're effectively giving it via "contains").
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