Hasse diagram

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Hasse diagram ‎(plural Hasse diagrams)

  1. (set theory) A diagram which represents a finite poset, in which nodes are elements of the poset and arrows represent the order relation between elements. Transitivity of the order relation is tacit, in other words, if  x \le y and y \le z then no arrow is drawn from x to z, but if there is no distinct z between x and y (such that  x \le z \le y ) then an arrow is draw from x to y.