  This work connects the idea of a "blow-up" of a quiver with that of
injectivity, showing that for a class of monic maps $\Phi$, a quiver is
$\Phi$-injective if and only if all blow-ups of it are as well. This
relationship is then used to characterize all quivers that are injective with
respect to the natural embedding of $P_{n}$ into $C_{n}$.
