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I have the Fourth Edition of Introduction to Electrodynamics by David J. Griffiths, published by Pearson.

I have found this erratum in Chapter 5 Magnetostatics, page 234 .

enter image description here We can see that "Product rule number 6" is written and no asterisk or dagger is there, so I looked in Chapter 1 and found this on page 21

enter image description here The "rule" which he is using is actually rule number 4.

I have seen the list of errata in the official site but couldn't find it.

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    $\begingroup$ Yes, that is a valid erratum. But you didn’t ask a question. $\endgroup$
    – G. Smith
    Commented Feb 8, 2020 at 18:23
  • $\begingroup$ @G.Smith :) I don’t know what to say but I think I have done for clarification and to spread awareness also :) $\endgroup$
    – user240696
    Commented Feb 8, 2020 at 18:28
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    $\begingroup$ Editing your previous question would have been more appropriate. $\endgroup$
    – G. Smith
    Commented Feb 8, 2020 at 18:37
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    $\begingroup$ This isn't a mistake, Griffiths is talking about equation 6 on the inside front cover, where all these results are listed for reference. (That's why they're numbered on page 21 with Roman numerals instead. "(iv)" isn't the same thing as "6".) $\endgroup$
    – knzhou
    Commented Feb 10, 2020 at 20:22

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