Definition 29.24.1. Let $f : X \to Y$ be a morphism of schemes.

1. We say $f$ is submersive1 if the continuous map of underlying topological spaces is submersive, see Topology, Definition 5.6.3.

2. We say $f$ is universally submersive if for every morphism of schemes $Y' \to Y$ the base change $Y' \times _ Y X \to Y'$ is submersive.

[1] This is very different from the notion of a submersion of differential manifolds.

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