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Project can be found in Overleaf here: https://www.overleaf.com/read/txwdgwzrfmyk

For some reason, \int, \iint and \Sigma do not show up anymore and I cannot seem to solve the problem. Any ideas?

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    please add a small complete document inline here not just use an external link. (your question is archived here forever and will not make sense if that link changes), however your overleaf project shows 43 errors in its log menu.If you get any error don't even look at the output, if you need help resolving an error, ask about that and add the full error text here. Commented Oct 15, 2019 at 17:43
  • Thanks for the response David Carlisle. I will take a look at the error log. I added the link because the project is quite extensive, do you know which part would be most useful to add for reference here? Commented Oct 15, 2019 at 17:45
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    Perhaps start by fixing the 35 errors instead of just ignoring them. In many cases latex will be set up to be able to compile through errors by making guesses. Those guesses can accumulate into strange things, so don't ignore errors
    – daleif
    Commented Oct 15, 2019 at 17:46
  • You should also learn to use siunitx to typeset units. \AA is not how we type Ångstrøm
    – daleif
    Commented Oct 15, 2019 at 17:48
  • The tab:cross table has a lot of negative numbers, look into siunitx on how to format these properly
    – daleif
    Commented Oct 15, 2019 at 17:50

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It appears that the issue arises because of the newtxmath package, although I am not sure about the technical reason. From the CTAN page of the package, I see that it has been updated only six days ago, so it is quite possible that it was this update which wreaked havoc with your integral signs.

After having read these two other SE posts (one and two), I propose two solutions:

  • You remove the newtxmath package;
  • You keep newtxmath but use esint as well.

Both solutions can be implemented by editing the file styles/style.sty of the kaobook template.

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  • This solved my issue, and I now have working mathmode again. A little sad with the outcome tho, as I really like the newtxmath font :-) Commented Oct 17, 2019 at 8:37
  • As soon as I have time, I will try to find a workaround to keep the newtxmath fonts and update the template. I hope to be done before your book is finished :) Commented Oct 17, 2019 at 10:33
  • That sounds great, thank you! Alternatively we can look for other fonts if that is easier too. Finally, as we discussed earlier in the project, I found a way to align the title when using \setchapterstyle{kao}. Simply adding \flushright{} in the title aligns the title with the right side line before the chapter number. I think the result looks great :-) Commented Oct 17, 2019 at 12:11
  • Dear Tommy, sorry for this lag, but I found a way for you to keep using newtxmath: simply don't load the lmodern package, as you now do in your main.tex. Apparently it conflicts with the integrals in newtxmath. By the way, in the next versions of the kaobook template I will not use mathpazo and newtxmath anymore, but rather I shall load newpx, which seems to offer considerable advantages (in particular, both the text and the math font will be palatino). Commented Dec 20, 2019 at 10:28

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