Definition:Separable Degree

Definition
Let $E / F$ be a field extension.

Let $S \subseteq E$ be the separable closure of $F$ in $E$.

The separable degree $\index E F_{\operatorname {sep} }$ of $E / F$ is the degree $\index S F$.

Also denoted as
The separable degree is also denoted $\index E F_s$

Also see

 * Definition:Inseparable Degree