1

enter image description here

I like this type of style for greek letter (the red part in the picture), can anybody tell me how to realize in latex and which package is necessary, Thanks in advance!!!

  • My welcome. Where have you taken, this picture, is it possible, please? Have you a pdf? – Sebastiano Jul 17 at 9:25
  • Did you try \varepsilon? – egreg Jul 17 at 13:36
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Two solution for the similar style of your image: using (1) \usepackage{kpfonts} or (2) \usepackage{newpxtext,newpxmath}.

(1) enter image description here

\documentclass[a4paper,12pt]{article}
\usepackage[T1]{fontenc}
\usepackage{kpfonts}
\usepackage{bbold}
\usepackage{bm}

\begin{document}
\[\bm{\dot{\sigma}}(\underline{z})=\mathbb{L}(\underline{z})\,\colon\,\bm{\dot{\varepsilon}}(\underline{z})\]
\end{document}

or (2)

enter image description here

\documentclass[a4paper,12pt]{article}
\usepackage{newpxtext,newpxmath}
\usepackage[T1]{fontenc}
\usepackage{bbold}
\usepackage{bm}

\begin{document}
\[\bm{\dot{\sigma}}(\underline{z})=\mathbb{L}(\underline{z})\,\colon\,\bm{\dot{\varepsilon}}(\underline{z})\]
\end{document}

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