For a prime $Q$ lying over a prime $P$, I have seen the ramification index of $Q$ over $P$ denoted by $e(Q|P)$ and the inertial degree of $Q$ over $P$ by $f(Q|P)$.
What is the origin of the notations $e$ and $f$?
2026-04-08 22:28:16.1775687296
notation for ramification index and inertial degree
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