Hi,
I noted the following strange comportment of LyX-1.4.3 (and didn't see something similar on bugzilla):
If I define a math command in the preamble, for example \def\MR{\mathscr},
when I use it in a math formula there is something curious:

If I type: \MR{C}, I see exactly this on the screen (\MR{ } in red, C in blue) and it is traduced (in TeX) by: $\MR{C}$

If I type: \MR{C}^2, the (red) { and } disappear (I see \MRC2, with \MR in red C in blue and 2 an exponent) and it is traduced by: $\MR C^{2}$ (which is curious but OK for compilation)

If I type \MR{CD}^2 it is traduced (correctly) by $\MR{CD}^{2}$, but the { and } disappear also on the screen

This is not the comportment of lyx for the internal commands it recognize
for example for \mathbb: \mathbb{C}^2  is traduced by: $\mathbb{C}^{2}$

This comportment appears in 1.4.3, it does not exists in the previous versions 1.4.x, 0<=x<3 which all traduce the second example by $\MR{C}^{2}$ (and show on the screen exactly what I type)

Is this a bug?
At least I don't like that.

PhC

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