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高维同调代数II：投射性

Higher Dimensional Homology Algebra II:Projectivity

Fang Huang, Shao-Han Chen, Wei Chen, Zhu-Jun Zheng

备注：
10 pages, 4 figures. This is the second paper of the series works on higher dimensional homology algebra. The first paper is "2-Modules and the Representation of 2-Rings\cite{4}". In the coming papers, we shall give the definition of injective object in the 2-category ($\cR$-2-Mod), prove that this 2-category has enough injective objects and develop the (co)homology theory of it
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摘要：

本文证明了对称2-群的2-范畴（2-SGp）和$\cR$-2-模（\cite{5}）的2-范畴（$\cR$-2-Mod）分别具有足够的投射对象.

英文摘要：

In this paper, we will prove that the 2-category (2-SGp) of symmetric 2-groups and 2-category ($\cR$-2-Mod) of $\cR$-2-modules(\cite{5}) have enough projective objects, respectively.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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