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Nov 8, 2023 at 14:42 comment added EdM @Wojty the ' is a standard symbol for the first derivative of a function of a single variable. In this case, $S'(t)=dS(t)/dt$.
Nov 8, 2023 at 13:37 comment added Wojty Could you clarify what S' is? how does it differ from S?
May 16, 2022 at 12:11 history answered EdM CC BY-SA 4.0