Salát Máté schrieb:

Can I manipulate my document inside LyX on the level of its tex code? For 
example I want to do a find-and-replace operation to change every \mathbf{R} to 
\mathbb{R} in a long document. How can I carry out this?

open the LyX file with a text editor and replace
\mathbf
with
\mathbb

regards Uwe

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