How can i change the color of some caracters or symbols in a formula inside a math environment ? Thru the menu Format->type->color, it has no effect in math mode (despite it functions well in non-math text).
in the mathbox: \textcolor{red}{blah} but pay attention, because LyX inserts the first closing parentheses itself and the second pair you get with \{
\usepackage{color} in the preamble
Herbert
