### 111.5.13 Taking roots of line bundles

This useful construction was discovered independently by Cadman and by Abramovich, Graber and Vistoli. Given a scheme $X$ with an effective Cartier divisor $D$, the $r$th root stack is an Artin stack branched over $X$ at $D$ with a $\mu _ r$ stabilizer over $D$ and scheme-like away from $D$.

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