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Nov 29, 2022 at 2:01 comment added AJN Since that step in the derivation doesn't involve any mathematical logic. From line 2 to 3, it is more of an assumption or definition rather than logic. So nothing wrong per se, I think. If you could have replaced $f$ by $\dots B u_{k-1}$ instead.
Nov 28, 2022 at 17:02 comment added Caretaker2995 Thank you, what is wrong in my development that leads me to $u_{n}$ instead of $u_{n-1}$ as derived in the linked source ?
Nov 28, 2022 at 15:17 history answered AJN CC BY-SA 4.0