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 Odd difference between \int in base LaTeX vs with amsmath package Don Hosek <[log in to unmask]> Thu, 1 Oct 2020 22:47:31 -0500 text/plain (9 kB) multipart/related (9 kB) , text/html (9 kB) , Screen Shot 2020-10-01 at 22.39.12.png (8 kB) , Screen Shot 2020-10-01 at 22.39.30.png (9 kB) While looking into this question 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. Given the following equation: $e^{i \int \!dt\,\frac{1}{2}m\dot x^2}$ I get with amsmath loaded and without it loaded. In both cases, the definition of \intop is the same and there doesn’t appear to be any functional difference between the redefined \int in amsmath and the definition of \int in fontmath.ltx So the questions are: (1) what’s happening differently in amsmath to change the appearance of the integral and (b) which is the correct behavior? -dh