# Use only \lambda in mathptmx

MWE

\documentclass[border=1mm]{standalone}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{lmodern}
%\usepackage{mathptmx}
\begin{document}

$\lambda = 3.14\ \Omega$
\end{document}


And output When I added \usepackage{mathptmx} The following figure is what I try to do. So I want to use only \lambda in mathptm. Is it typographically incorrect? Can you help me?

Note: egreg's solution Not exactly for me. • why the strange markup $\lambda$ = 3.14 $\Omega$ with = not in math? rather than the more standard $\lambda= 3.14 \Omega$ Dec 9, 2017 at 13:51
• @DavidCarlisle When I asked the question, I wrote it like that. I read your warning carefully Dec 10, 2017 at 2:51

The solution is egreg's solution minus the two letters up (\lambda instead of \uplambda):

\documentclass[border=1mm]{standalone}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{lmodern}

\DeclareSymbolFont{myletters}{OML}{ztmcm}{m}{it}
\DeclareMathSymbol{\lambda}{\mathord}{myletters}{"15}

\begin{document}
$\lambda$ = 3.14 $\Omega$
\end{document} • I could not believe the answer was that easy. And the result is exactly what I want. Dec 9, 2017 at 8:32
• I look at the entire document. It looks like the lambda looks a bit dark. Can you check? More specifically here, $\lambda = \dfrac{c}{f}$ Dec 10, 2017 at 15:33
• @Özgür What do you expect, when the lambda is taken from a different font? Dec 10, 2017 at 15:47
• You're right. I did not think in that respect. I was so concentrated on the document. Dec 10, 2017 at 15:56