Am Thu, 1 Oct 2020 22:47:31 -0500 schrieb Don Hosek: > While looking into this question https://tex.stackexchange.com/questions/565031/slightly-bigger-integral-in-exponent <https://tex.stackexchange.com/questions/565031/slightly-bigger-integral-in-exponent> I found that the formatting of \int differs slightly when using the amsmath package vs the base LaTeX with the former using a scriptstyle integral while the base uses a textstyle integral. > So the questions are: (1) what¢s happening differently in amsmath > to change the appearance of the integral amsmath use a different cmex font: cmextra/cmex7.pfb instead of cmex10.pfb because of this code part \ifnum\cmex@opt=7 \relax \DeclareFontShape{OMX}{cmex}{m}{n}{% <-8>cmex7<8>cmex8<9>cmex9% <10><10.95><12><14.4><17.28><20.74><24.88>cmex10% }{}% \expandafter\let\csname OMX/cmex/m/n/10\endcsname\relax \else you can get the "classical" appearance with \usepackage[cmex10]{amsmath} > and (b) which is the correct behavior? Well like always, it is a matter of taste, but I would say they made the change because they think it looks better like this and I agree. -- Ulrike Fischer http://www.troubleshooting-tex.de/