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Why does \cal{M}_n give “M>” in parts of my LaTeX file and works correctly in other parts?

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1 Answer

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The correct syntax is

$\mathcal{C}_n$

The \cal command was used in LaTeX 2.09 and has been obsolete since the release of LaTeX2e (1992). It worked as a font change declaration rather than a command with argument, so the right way would have been

${\cal C}_n$

which is quite confusing.

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