When linear and weak discrepancy are equal

The linear discrepancy of a poset P is the least k such that there is a linear extension L of P such that if x and y are incomparable, then | h L ( x ) − h L ( y ) | ≤ k , whereas the weak discrepancy is the least k such that there is a weak extension W of P such that if x and y are incomparable, then | h W ( x ) − h W ( y ) | ≤ k . This paper resolves a question of Tanenbaum, Trenk, and Fishburn on characterizing when the weak and linear discrepancy of a poset are equal. Although it is shown that determining whether a poset has equal weak and linear discrepancy is NP -complete, this paper provides a complete characterization of the minimal posets with equal weak and linear discrepancy. Further, these minimal posets can be completely described as a family of interval orders.