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Hello fellow mathematicians. Can anybody help me understand what the minus (-) sign in this derivative means? Its the usual d/dy but with a minus added d-/dy. I can't find references, the book cited in the paragraph above doesn't explain either and I had never encountered it. I suspect it has to do with lateral diferentiation. I can't embed images since I usually read and never post.

I've found it on this article https://doi.org/10.1007/s11538-018-00558-w page 11, formula (15)

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  • $\begingroup$ It seems to just be a typo because the $\kappa_{n}$ is actually normally differentiable since it is an integral with x as an endpoint. $\endgroup$
    – Thomas Kojar
    Commented Apr 2, 2023 at 18:31
  • $\begingroup$ It could have meant something like a Dini derivative (eg. left-limit), but it is mentioned nowhere in the article. $\endgroup$
    – Thomas Kojar
    Commented Apr 2, 2023 at 18:32
  • $\begingroup$ You could try contacting the author to fix/explain it and prevent confusion for others. $\endgroup$
    – Thomas Kojar
    Commented Apr 2, 2023 at 18:33
  • $\begingroup$ @ThomasKojar thank you very much. I doubt it is a typo since it is written half a dozen times. I have no idea how to contact the author but I will try. Were you able to follow the proof ignoring it? $\endgroup$
    – Comeberza
    Commented Apr 3, 2023 at 21:42
  • $\begingroup$ Yes. They probably just used some macro witn an error or copy-pasted the wrong command. $\endgroup$
    – Thomas Kojar
    Commented Apr 3, 2023 at 21:44

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