What is the meaning of
\mathcal allowed only in math mode
What sign should I use to fix this error?**
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What is the meaning of
\mathcal allowed only in math mode
What sign should I use to fix this error?**
rsfsorbrushscript, for instance), and you can use them if you load the relevant package. – Bernard Jan 12 '19 at 21:50blah blah \mathcal{A} blah blahin your text. Instead you should haveblah blah $\mathcal{A}$ blah blah. – Werner Jan 12 '19 at 23:36