How do I get a proper mathematical \Lambda when using gfsneohellenic?

Question

I am using the gfsneohellenic for my paper (which is in English). I load it using:

\usepackage[LGR,T1]{fontenc}
\usepackage[default]{gfsneohellenic}

Everything works fine except for capital greek letters! In other words when I use $\Lambda$ instead of using the corresponding lambda in the neohellenic package LaTeX uses Lambda from computer modern!

This is really annoying since computer modern looks quite different from neohellenic and the inconsistency makes my paper look very ugly.

Answer 1

You could redefine \Lambda to use gfsneohellenic:

\documentclass{article}
\usepackage[default]{gfsneohellenic}
\usepackage[greek,english]{babel}
\usepackage{amsmath}
\let\CMLambda\Lambda
\newcommand*{\gfs}[2]{\renewcommand*{#1}{\mathalpha{\text{%
  \selectlanguage{greek}\textneohellenic{#2}}}}}
\gfs{\Lambda}{L}
\begin{document}
\begin{tabular}{ll}
  Neohellenic text: & {\selectlanguage{greek}\textneohellenic{L}} \\
  Neohellenic math: & $\Lambda$ \\
  Computer Modern:  & $\CMLambda$
\end{tabular}
\end{document}

I saved the original Computer Modern \Lambda in \CMLambda. This way it's still accessible for comparing. Here's the output:

For convenience, here's the an example font table of gfshellenic:

I created it using this code:

\documentclass{article}
\usepackage{fonttable}
\begin{document}
\fonttable{gneohellenicrg6r}
\end{document}

Replace gneohellenicrg6r by cmr9 to see a Roman table. This might help you to get the correspondence that you asked for in your comments.

Answer 2

According to the package documentation you should load cmbright as well as gfsneohellenic. Did you try something like

\documentclass{article}
\usepackage{cmbright}
\usepackage[default]{gfsneohellenic}
\begin{document}
\[ \Lambda = \lambda \]
\end{document}