Deactivating italic text in body of a "definition" environment

Question

I definied a new theorem via

\newtheorem{def}{definition}

But the text has a italic font and i do not want that. how can i deactivate the italic font?

Aside: LaTeX won't let you set up an environment called def. You'll get an error message such as ! LaTeX Error: Command \def already defined.. Use defn or something else instead. — Mico, Nov 22 '16 at 16:51
potential duplicate: Non italic text in theorems, definitions, examples — barbara beeton, Nov 22 '16 at 16:55

score 4 · Accepted Answer · answered Nov 22 '16 at 16:46

4

I assume you're using a theorem-related package such as amsthm. If that's the case, just issue the instruction

\theoremstyle{definition}

ahead of the instruction

\newtheorem{defn}{Definition}

A full MWE:

\documentclass{article}
\usepackage{amsthm,lipsum}
\theoremstyle{definition}
\newtheorem{defn}{Definition}
\begin{document}
\begin{defn}[Lipsum]
\lipsum*[2] % filler text
\end{defn}
\end{document}

answered Nov 22 '16 at 16:46

Mico

506,678

If you use the ntheorem package rather than the amsthm package to set up theorem-like environments, you should replace \theoremstyle{definition} with \theorembodyfont{\upshape}. – Mico Nov 22 '16 at 16:56

Deactivating italic text in body of a "definition" environment

1 Answers1