Calligraphic (LaTeX2e unofficial reference manual (November 2018))

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#### 16.2.4 Calligraphic

Synopsis:

    \mathcal{uppercase-letters}

Use a script-like font.

In this example the graph identifier is output in a cursive font.

    Let the graph be \( \mathcal{G} \).

If you use something other than an uppercase letter then you do not get an error but you also do not get math calligraphic output. For instance, `\mathcal{g}` outputs a close curly brace symbol.

Unofficial LaTeX2e reference manual