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I typed fr<TAB> as is written in the manual but got only a fr and a tab. The \frac{}{} is not correctly inserted and so does sq. Why is this happening?

  • Please provide a more complete, step-by-step recipe, preferably starting from emacs -Q (no init file). – Drew Aug 3 '17 at 4:30
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By typing C-c ? you can activate the CDLaTeX Help, in which you will see TEXT/MATH, TEXT/, or MATH. This means that the function or abbreviation can only activated in the text mode, math mode or both of them of latex. Insert the desired command between $$ to activate it. This is pretty much a LaTeX problem than an Emacs problem.

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