[Tex/LaTex] \mathrm{\Delta} in slant in the equation environment

equationsslantedtemplates

I tried to write an equation, including \Delta. But it also shows in slant, even though I tried \mathrm{} or \text{}.
CUEDthesisPSnPDF template and two math packages are used

\usepackage{amssymb}
\usepackage{amsmath}

\begin{equation}
  \Delta E \Delta{t} \approx \frac{h}{2 \pi}\\
  \mathrm{\Delta} E \, \text{\Delta} t
  \label{fun:naturalline}
\end{equation}

enter image description here

It seems \mathrm does not work here.
How can I solve this problem? Thank you in advance.

Best Answer

You could load the upgreek package and write \Updelta to generate an 'upright' uppercase-Delta character.

enter image description here

\documentclass{article}
\usepackage{upgreek}
\begin{document}
$\delta$ $\updelta$

$\Delta$ $\Updelta$ % note: \Updelta, not \upDelta
\end{document}
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