Definition 29.23.1. Let f : X \to S be a morphism.
We say f is open if the map on underlying topological spaces is open.
We say f is universally open if for any morphism of schemes S' \to S the base change f' : X_{S'} \to S' is open.
Definition 29.23.1. Let f : X \to S be a morphism.
We say f is open if the map on underlying topological spaces is open.
We say f is universally open if for any morphism of schemes S' \to S the base change f' : X_{S'} \to S' is open.
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