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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 $f$?

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    check hilbert's zahlbericht maybe2011-08-14

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