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


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.

e \equiv \lim_{n\to\infty} \biggl( 1 + \frac{1}{n} \biggr)^n = 2.7182818284590452353602874713526624977572\hdots

Note however that mathptmx is obsolete; if you want to use a Times clone you should use newtx instead.