greekletters
For the following example I'm getting Missing $ inserted... with regard to the \rho command:
a tangible benefit from acquiring positive reputation that is not captured within
\citet{d05a}, in particular, it implies that in this setting \rho rises over time.
I tried $rho$, as it seemed to be suggesting, but that just put the word rho in italics.
Unless using a special font, the macro\boldsymbol from amsbsy package should do.
(Beware, that math typesetting will make the bookmarks weird if used unless \texorpdfstring with appropiate workaround is applied)
\documentclass{article}
\usepackage{amsbsy}
\usepackage[unicode]{hyperref}
\begin{document}
\section{Not bold $\pi$}
\section{Bold $\boldsymbol{\pi}$}
\section{Bold \texorpdfstring{$\boldsymbol{\pi}$}{\textpi}}
\end{document}
Remove the call of the breqn package.
After the operation I get
Note that subfigure has been obsolete for several years. The official replacement is subfig. Alternatively, use subcaption. Note that the class already loads caption, so subcaption should probably be chosen.
I add a version without \left and right, which don't seem necessary (they rarely are in cases like this) and where the superscripts (n) are similar to the one for Gamma. More importantly, the two consecutive equations are together in a gather environment: two equation environments should never appear immediately after one another.
\begin{subequations}
\begin{gather}
[ \tilde{V}^{-^{(n)}} ] = [ \Gamma^{(n)} ] [ \tilde{V}^{+^{(n)}} ],
\\
[ \tilde{V}^{-\,(n)} ] = [ \Gamma^{(n)} ] [ \tilde{V}^{+\,(n)} ],
\end{gather}
\end{subequations}
In order to accommodate the split formula where you use \left and \right across lines, just remove all of them; for better clarity, some of the fences can be made \big, but not more than that. Note that multline is the environment of choice for this.
\begin{multline}
[V_m^{(n)}(z)]=[ P^{(n)} ]
\bigl( \bigl[ \exp \bigl( -j k ^{(n)} ( z-z_n) \bigr) \bigr] [ \tilde{V}^{+^{(n)}}] + \\
\bigl[ \exp \bigl( +j k ^{(n)} ( z-z_{n+1} ) \bigr) \bigr] [ \tilde{V}^{-^{(n)}} ]\bigr)
\end{multline}
Best Answer
If you can use unicode-enabled engines such as XeTeX or LuaTeX, you can simply add the greek letter ρ into the document.
If you stick to tex of pdftex as engines, you can find a way by the
inputencpackage, for example here you can find some help.In all cases,
\(\rho\)or$\rho$will give you a ρ in italics. If you need in upright shape, you can use theupgreekpackage for that.