Lemma 37.29.6. Let $f : X \to Y$, $s : Y \to X$ be as in Situation 37.29.1. Assume
$f$ is of finite presentation and flat, and
all fibres of $f$ are geometrically reduced.
Then $X^0$ is open in $X$.
Lemma 37.29.6. Let $f : X \to Y$, $s : Y \to X$ be as in Situation 37.29.1. Assume
$f$ is of finite presentation and flat, and
all fibres of $f$ are geometrically reduced.
Then $X^0$ is open in $X$.
Proof. This is an immediate consequence of Lemma 37.29.5. $\square$
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