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arXiv 2103.01156math.ATmath.CT
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单纯对象上的模型范畴结构

Model category structures on simplicial objects

Fritz Hörmann

摘要:

描述了提升范畴S中的弱因子分解系统来模拟S中单纯对象上的范畴结构的一般方法,类似于提升阿贝尔范畴中的余挠对来模拟链复形上的范畴结构.这概括了奎伦的原始治疗(投影)模型范畴结构的单纯对象。作为一个新的应用,我们表明,在任何(甚至是大的)有限极限范畴S的余积完备化中,单纯对象上总是存在一个模型范畴结构,如果S很小,它定义了与S上单纯预层的任何全局模型范畴相同的同伦理论。此外,如果S是广延的,则在S自身的单纯对象上存在类似的模型范畴结构。在任何情况下,相关的左导子存在于所有图上,尽管在原始范畴中缺乏共极限。

英文摘要:

A general method for lifting weak factorization systems in a category S to model category structures on simplicial objects in S is described, analogously to the lifting of cotorsion pairs in Abelian categories to model category structures on chain complexes. This generalizes Quillen's original treatment of (projective) model category structures on simplicial objects. As a new application we show that there is always a model category structure on simplicial objects in the coproduct completion of any (even large) category S with finite limits, which - if S is small - defines the same homotopy theory as any global model category of simplicial pre-sheaves on S. If S is, in addition, extensive, a similar model category structure exists on simplicial objects in S itself. In any case the associated left derivator exists on all diagrams despite the lack of colimits in the original category.

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