I'm trying to add a tilde over some letters of an equation. Yet, the program tells me that
Missing { inserted.
<to be read again>
\gdef l.253 ...B =\widetilde{b}+ \widetilde{A} x_\bar{b}
\\
This the disfonctionning part of my program:
\begin{equation*}
\begin{cases}
x_B =\widetilde{b}+ \widetilde{A} x_\bar{b}\\
z =\underbrace{\alpha}_{scalaire}+\tilde{C}^T x_\bar{B}\\
x_B,x_\bar{b}\ge 0\\
\end{cases}
x_B=
\end{equation*}
It seems either to be a fool mistake which I can't find or to be an error above in the document, isnt't it? Can you give me some help?
x_{\bar b}
.x_\bar b
is a single element isn't it?\bar
._{scalaire}
should be_{\mathit{scalaire}}
the default math font is designed to make adjacent letters not look like a word but as a product of variables.