Definition 109.21.2. Let $f : X \to S$ be a family of curves. We say $f$ is a semistable family of curves if
$X \to S$ is a prestable family of curves, and
$X_ s$ has genus $\geq 1$ and does not have a rational tail for all $s \in S$.
Definition 109.21.2. Let $f : X \to S$ be a family of curves. We say $f$ is a semistable family of curves if
$X \to S$ is a prestable family of curves, and
$X_ s$ has genus $\geq 1$ and does not have a rational tail for all $s \in S$.
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