MinorantPreorder A=(0,1)={x∣0<x<1}A=(0,1) = \{x|0<x<1\}A=(0,1)={x∣0<x<1}infA=0\inf A = 0infA=0supA=1\sup A = 1supA=1lower bound L={y∣y≤x,∀x∈A}L = \{y | y \le x , \forall x \in A \}L={y∣y≤x,∀x∈A}upper bound U={y∣y≥x,∀x∈A}U = \{y | y \ge x , \forall x \in A \}U={y∣y≥x,∀x∈A}
