On 2013-03-13, Csikos Bela wrote:
> Hello:

> How can I edit text written in math mode in lyx?
> An example: I write a fraction using \textrm for both
> the numerator and the denominator. Then I decide to
> change these to sans serif (textsf). How can I apply
> the change to the fraction's numerator and denominator?
> (ie. change the code \textrm to \textsf)?

Third method: 

* select and cut the fraction
* paste into text - will appear as LaTeX macros
* edit
* cut and paste back to the formula

This also works for complete formulas. Then, alternatively, you can select
the LaTeX-macros-text and convert to a math box via Ctrl-M (or Alt-M D for a
display formula).

G√ľnter

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