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How to use the (restrained) "CM calligraphic, cmsy", mentioned in "What are all the font styles I can use in math mode?"? Can you provide a minimum working example please? enter image description here

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    why the -1 vote?
    – Ommo
    Commented Sep 6, 2023 at 11:09
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    Let me preface this by saying that I do not give negative votes; perhaps you could do it yourself. If I understand you correctly, you want normal and bold calligraphic characters?
    – Sebastiano
    Commented Sep 6, 2023 at 11:14
  • Thanks for your comment @Sebastiano. Of course I can do it by myself, but I do not understand where "cm" or "cmsy" is contained....in which package?
    – Ommo
    Commented Sep 6, 2023 at 11:18
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    I think here: \DeclareMathAlphabet{\mathcal}{OMS}{cmsy}{m}{n}
    – Sebastiano
    Commented Sep 6, 2023 at 11:20

2 Answers 2

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Just for the sake of variety, here's a solution that employs the mathalpha package. Aside: the screenshot shown in the OP's query originates from the user guide of the mathalpha package.

enter image description here

\documentclass{article}
\usepackage[cal=cm]{mathalpha}

\begin{document}
$\mathcal{ABC\dots XYZ}$ \quad $\mathbfcal{ABC\dots XYZ}$
\end{document}
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    Great answer @Mico!!!!! Many many thanks!!!! :-)
    – Ommo
    Commented Sep 7, 2023 at 9:15
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    @limone - You're most welcome.
    – Mico
    Commented Sep 7, 2023 at 9:20
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    @limone Please, can you give the green check mark to Mico seen that is the great answer? Thank you.
    – Sebastiano
    Commented Sep 7, 2023 at 11:18
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    Done :-) Btw, I would have accepted both Answers, many thanks to both! :-)
    – Ommo
    Commented Sep 7, 2023 at 11:19
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    @Sebastiano - Thanks for being so generous! (Incidentally, I upvoted your answer before posting mine...)
    – Mico
    Commented Sep 7, 2023 at 11:25
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\documentclass[12pt]{article}
\usepackage{amsmath,amssymb}
\DeclareMathAlphabet\mathbfcal{OMS}{cmsy}{b}{n}
\begin{document}
  $\mathcal{ABCDEFGHILMNOPQRRSTUVZ}$, $\mathbfcal{ABCDEFGHILMNOPQRRSTUVZ}$
\end{document}

enter image description here

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    thanks a lot! I did not know about the \DeclareMathAlphabet\mathbfcal{OMS}{cmsy}{b}{n} command, thanks a lot!
    – Ommo
    Commented Sep 6, 2023 at 11:20
  • I have noticed that, for the not-bold case, I get what you get only if I add this line \DeclareSymbolFont{symbols} {OMS}{cmsy}{m}{n}, just after \DeclareMathAlphabet\mathbfcal{OMS}{cmsy}{b}{n}
    – Ommo
    Commented Sep 6, 2023 at 13:50
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    @limone for the non bold, you can simply use \mathcal no definition is needed, it is standard latex
    – David Carlisle
    Commented Sep 6, 2023 at 21:18
  • Thanks a lot @David Carlisle.... Initially, I indeed just used \mathcal, but with just that command, I did not get my desired font... but then, just by adding \DeclareSymbolFont{symbols} {OMS}{cmsy}{m}{n}, I was able to get the desired output.... I do not why to be honest...... :-)
    – Ommo
    Commented Sep 7, 2023 at 9:14
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    @limone that's the default definition so you are just using standard \mathcal
    – David Carlisle
    Commented Sep 7, 2023 at 14:41

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