We introduce, for every integer $n geq 1$, the notion of an $n$-relative category and show that the category of the small $n$-relative categories is a model for the homotopy theory of $n$-fold homotopy theories, i.e., homotopy theories of… homotopy theories.
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机译：我们为每个整数$ n geq 1 $引入$ n $相对类别的概念，并证明较小的$ n $相对类别的类别是$ n $ -fold同伦理论的模型同伦理论，即…同伦理论的同伦理论。
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