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Results tagged with extension
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user 197402
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Extensions in a full subcategory
Moreover, since the subcategory is full, an extension $0\to B\to X\to A\to 0$ with $X\in \mathcal{D}$ splits in $\mathcal{D}$ if and only if it splits in $\mathcal{C}$, so we have that $$\mathrm{Ext}^1 …
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