传递闭包
传递闭包、即在数学中，在集合 X 上的二元关系 R 的传递闭包是包含 R 的 X 上的最小的传递关系。
例如，如果 X 是(生或死)人的集合而 R 是关系“为父子”，则 R 的传递闭包是关系“x 是 y 的祖先”。再比如，如果 X 是空港的集合而关系 xRy 为“从空港 x 到空港 y 有直航”，则 R 的传递闭包是“可能经一次或多次航行从 x 飞到 y”。
Transitive closure
中文百科
英语百科
Transitive closure 传递闭包
In mathematics, the transitive closure of a binary relation R on a set X is the smallest relation on X that contains R and is transitive. For example, if X is a set of airports and x R y means "there is a direct flight from airport x to airport y", then the transitive closure of R on X is the relation: "it is possible to fly from z to w in one or more flights for any z and w in X." Informally, the transitive closure is the set of all places you can get to from any starting place.
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