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In mathematics, especially order theory, the covering relation of a partially ordered set is the binary relation which holds between comparable elements that are immediate neighbours. The covering relation is commonly used to graphically express the partial order by means of the Hasse diagram. Definition Let X {\displaystyle X} be a set with a partial order {\displaystyle \leq }. As usual, let < {\displaystyle <} be the relation on X {\displaystyle X} such that x < y {\displaystyle x<y} if and only if x y {\displaystyle x\leq y} and x y {\displaystyle x\neq y}. Let x {\displaystyle x} and y {\displaystyle y} be elements of X {\displaystyle X}. Then y {\displaystyle y} covers x {\displaystyle x}, written x y {\displaystyle x\lessdot y}, if x < y {\displaystyle x<y} and there is no element z {\displaystyle z} such that x < z < y {\displaystyle x<z<y}. Equivalently, y {\displaystyle y} covers x {\displaystyle x} if the interval [ x, y ] {\displaystyle [x, y]} is the two-element set { x, y } {\displaystyle \{x, y\}}. When x y {\displaystyle x\lessdot y}, it is said that y {\displaystyle y} is a cover of x {\displaystyle x}. Some authors also use the term cover to denote any such pair ( x, y ) {\displaystyle (x, y)} in the covering relation. Examples In a finite linearly ordered set {1, 2,..., n}, i + 1 covers i for all i between 1 and n 1 (and there are no other covering relations).

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