Can you help me?
I do not know what to type in order to show the conjugation.
I mean that the matrix B has complex entries and C is the transpose matrix of B, then B* is C with a line above.
How do I do that?
Can you help me?
I do not know what to type in order to show the conjugation.
I mean that the matrix B has complex entries and C is the transpose matrix of B, then B* is C with a line above.
How do I do that?
If you are referring to the Conjugate transpose, then the following is what you're after - a standard \overline:

\documentclass{article}
\let\conjugatet\overline
\begin{document}
\[
(\mathbf{A}^*)_{ij} = \conjugatet{\mathbf{A}_{ji}}
\]
\end{document}
Following the guideline in Consistent typography, I've defined \conjugatet to be equivalent to \overline.
Wikipedia page: https://en.wikipedia.org/wiki/Conjugate_transpose
\overline{C}. – Alan Munn May 15 '13 at 22:32