relations - Finding all posets on a set - Mathematics Stack Exchange

url
https://math.stackexchange.com/questions/241782/finding-all-posets-on-a-set

I'm trying to wrap my head around the concept, but I'm still not quite getting it. (My instructor talked about a Hasse diagram, but am I always to use those/would it make it way easier?) If anyone could explain this concept a bit more clearly than my notes, that would be very good!