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