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I would like to use a big mathcal R for the Ramanujan summation. From a previous question (Math operator resizing in autosized brackets), I got

\documentclass{article}

\def\xRsum#1#2{\hbox{#1$#2\mathcal R$}}
\newcommand\Rsum{\mathop{%
    \mathchoice
    {\xRsum\huge\displaystyle}%
    {\xRsum{}\displaystyle}%
    {\xRsum{}\scriptstyle}%
    {\xRsum{}\scriptscriptstyle}%
}}

\begin{document}
    $$\sum_{k=1}^{+\infty}k\neq-\frac1{12}\qquad\Rsum_{k=1}^{+\infty}k=-\frac1{12}$$
    $$\frac1{\Rsum_{k=1}^{+\infty}\frac1{k^2}}=\frac1{\sum_{k=1}^{+\infty}\frac1{k^2}}$$
\end{document}

but it does not correct produce output.

output

You can see everything is aligned very badly.

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  • Unfortunately, closing this as a dupe doesn’t let me post this as an answer, but: upscaling this way makes the script R come out too heavy. Therefore, your \displaystyle variation should actually upscale a lighter-weight math font, such as KPMath-Light, while your \textstylr` variation should use something like KPMath-Regular. If you have to use a math font that doesn’t come in light weight (and most don’t), you can at least use \mathbfscr versus \mathscr for consistency.
    – Davislor
    Nov 24, 2022 at 14:01
  • For example, the solution at the bottom of this answer, but wrapped in \mathop for series-like spacing and limits.
    – Davislor
    Nov 24, 2022 at 14:02
  • @Davislor Thank you for your answer, my biggest issue is size/alignment but indeed it come out too heavy. I will take a look at this answer
    – user285558
    Nov 24, 2022 at 14:15

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