Higher Dimensional Homology Algebra II:Projectivity
classification
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categoryalgebracitedimensionalenoughgroupshigherhomology
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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.
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