Hi!
It seems that when using cases inset in formulas, LyX does not pass
\usepackage{amsmath} to LaTeX. When I edit formulas with cases, everything is
fine, but when I try to print, TeX complains on errors. It seems to be a
small bug that did appear between 1.2.1 and 1.3.0. Solution is to redefine
method validate of class MathCasesInset, so that it will always require
package amstech.
Hope it will help somebody.
Andrey Volkov.
diff lyx-1.3.0unmod/src/mathed/math_casesinset.C
lyx-1.3.0/src/mathed/math_casesinset.C
10a11
> #include "LaTeXFeatures.h"
70a72,78
>
> void MathCasesInset::validate(LaTeXFeatures & features) const
> {
> features.require("amsmath");
>
> MathNestInset::validate(features);
> }
diff lyx-1.3.0unmod/src/mathed/math_casesinset.h
lyx-1.3.0/src/mathed/math_casesinset.h
30a31,32
> ///
> void validate(LaTeXFeatures & features) const;
