Definition 15.41.1. A ring map $R \to \Lambda $ is *regular* if it is flat and for every prime $\mathfrak p \subset R$ the fibre ring

\[ \Lambda \otimes _ R \kappa (\mathfrak p) = \Lambda _\mathfrak p/\mathfrak p\Lambda _\mathfrak p \]

is Noetherian and geometrically regular over $\kappa (\mathfrak p)$.

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