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Date:         Fri, 2 Oct 2020 11:21:55 +0200
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From:         Ulrike Fischer <news3@NILILAND.DE>
Subject: Re: Odd difference between \int in base LaTeX vs with amsmath package
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Status: R

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┬ 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/