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第325行： − 嵌套层次结构或包含层次结构是嵌套集的层次结构排序。嵌套的概念在俄罗斯套娃中得到了体现。每个洋娃娃都被另一个洋娃娃包裹着，一直到最外层的。外部的洋娃娃包含所有其内部的洋娃娃，往外一层的洋娃娃也包含所有其内部剩余的洋娃娃，如此反复。套娃结构是一个每层都只有一个对象的嵌套层次结构，例如在套娃中同样大小的洋娃娃只有一个；广义的嵌套层次可以每层都有多个对象，但每层里的对象都只有一个父级对象。嵌套层次的一般概念的论证及数学表达如下：+
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A nested hierarchy or inclusion hierarchy is a hierarchical ordering of nested sets. The concept of nesting is exemplified in Russian matryoshka dolls. Each doll is encompassed by another doll, all the way to the outer doll. The outer doll holds all of the inner dolls, the next outer doll holds all the remaining inner dolls, and so on. Matryoshkas represent a nested hierarchy where each level contains only one object, i.e., there is only one of each size of doll; a generalized nested hierarchy allows for multiple objects within levels but with each object having only one parent at each level. The general concept is both demonstrated and mathematically formulated in the following example:
A nested hierarchy or inclusion hierarchy is a hierarchical ordering of nested sets. The concept of nesting is exemplified in Russian matryoshka dolls. Each doll is encompassed by another doll, all the way to the outer doll. The outer doll holds all of the inner dolls, the next outer doll holds all the remaining inner dolls, and so on. Matryoshkas represent a nested hierarchy where each level contains only one object, i.e., there is only one of each size of doll; a generalized nested hierarchy allows for multiple objects within levels but with each object having only one parent at each level. The general concept is both demonstrated and mathematically formulated in the following example:
嵌套层次结构或包含层次结构，是指嵌套集的层次结构排序。嵌套的概念在俄罗斯套娃中得到体现。每个洋娃娃都被另一个洋娃娃包裹着，一直到最外层的。外部的洋娃娃包含所有其内部的洋娃娃，往外一层的洋娃娃也包含所有其内部剩余的洋娃娃，如此反复。套娃结构是一个每层都只有一个对象的嵌套层次结构，例如在套娃中同样大小的洋娃娃只有一个；广义的嵌套层次可以每层都有多个对象，但每层里的对象都只有一个父级对象。嵌套层次的一般概念的论证及数学表达如下：