David Obadia wrote:
On Sat, Jan 17 (14:48), Paul Smith wrote:

Eg, \renewcommand\Re{\mathbf{Re}}

I think \Re means the real part of a number (just as \Im is the imaginary part). \mathbf{Re} will give the symbol of Real numbers


\usepackage{dsfont}
\newcommand\R{\mathds{R}}

in the preamble and then use \R, it will work. But is there a way to
have LyX display it right (as opposed to a "red" R) ?

Try and use a math-macro in lyx.
If you define it to be \mathbf{Re}, then \R will be replaced automatically (in math-mode) with the propper symbol. Also, you can use the extra right field of the math-macro, to tell lyx how to display the command in math-mode.


Amir.




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