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Physics

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  • $\begingroup$ Well it is not really different from the notation $f^\prime\vert_{x=0}$, for a function $f:\mathbb R\longrightarrow \mathbb R$ and means that you perform the derivative of $f$ and evaluate it at $0$. $\endgroup$
    – Tobias Fünke
    Commented Dec 5, 2022 at 14:39
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    $\begingroup$ @TobiasFünke Please don't put answers in comments. $\endgroup$
    – Massimo Ortolano
    Commented Dec 5, 2022 at 14:40
  • $\begingroup$ @MassimoOrtolano You're right. But I did not want to expand this further and hoped someone else will do so in an answer, which actually just happened. $\endgroup$
    – Tobias Fünke
    Commented Dec 5, 2022 at 14:42