[Tex/LaTex] How to write Euler’s e with its special font

eulerfontsformatting

I have searched but its surprisingly difficult to find, I want an e that looks like this one instead of the default e:
enter image description here

Best Answer

I think this is simply an "e" in a Times clone. Your image seems to have been produced with mathptmx.

\documentclass[11pt]{article}
\usepackage{amsmath}
\usepackage{mathptmx}
\begin{document}
\[
e \equiv \lim_{n\to\infty} \biggl( 1 + \frac{1}{n} \biggr)^n = 2.7182818284590452353602874713526624977572\hdots
\]
\end{document}

Note however that mathptmx is obsolete; if you want to use a Times clone you should use newtx instead.