Question
Consider the commutative diagram with exact rowIf $k$ is an isomorphism with inverse $\ell$, prove exactness of$$B^{\prime} \stackrel{i}{\longrightarrow} B \stackrel{p}{\longrightarrow} B^{\prime \prime} .$$
Step 1
We want to show that $\text{im}(i) = \ker(p)$. To do this, we will show that $\text{im}(i) \subseteq \ker(p)$ and $\ker(p) \subseteq \text{im}(i)$. Show more…
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