I am trying to conform to the International Standard ISO 80000-2. The isomath
package does a nice job, but it does not solve the problem of the missing upright/roman small Greek letters, needed for pi, Kronecker delta and the Levi-Civita symbol. This can be achieved in many ways, but usually the resulting Greek letters are clearly of a different font than their italics counterpart ones (I'm using the standard Computer Modern font).
The following code implements a very nice upright delta (all greek letters can be achieved in a similar fashion).
\documentclass{article}
\usepackage[libertine]{newtxmath}
\DeclareMathSymbol{\deltaup}{\mathord}{lettersA}{14}
\begin{document}
$\delta\deltaup$
\end{document}
That is, the above code declares the wanted macro \deltaup
using the symbol font lettersA, which itself is loaded by newtxmath
. This works correctly, but as an unwanted side effect, loading newtxmath
replaces the used math font in the document, which I do not want to alter.
Best Answer
You can use the CBfonts by Claudio Beccari, that are based on the Computer Modern design.
A less efficient solution that doesn't waste a math font family, is with
textalpha
:The output is the same.
If you want to use the upright Greek used when
\usepackage[libertine]{newtxmath}
is loaded, then here's the trickIn my opinion the result is decidedly worse.