# New Theorem Style : equivalent ConteXt and LateX

I used LaTeX for a long time before converting (with difficulty !) to ConteXt. For example, to define my new theorems, I used the amsthm package and I did this :

\newtheoremstyle{theoremdd}% name of the style to be used
{\topsep}% measure of space to leave above the theorem. E.g.: 3pt
{\topsep}% measure of space to leave below the theorem. E.g.: 3pt
{\itshape}% name of font to use in the body of the theorem
{0pt}% measure of space to indent
{. ---}% punctuation between head and body
{ }% space after theorem head; " " = normal interword space
{\thmname{#1}\thmnumber{ #2}\thmnote{ (#3)}}

\theoremstyle{theoremdd}
\newtheorem{thmd}{Theorem}[section]


Here is what I propose with ConteXt:

\setupenumerations[
before={\blank},
after={\blank},
text=Théorème,
alternative=serried,
title=no,
prefix=yes,
prefixsegments=chapter,
way=bysection,
numberstopper={. ---},
titlestyle=bold,
style=italic,

\defineenumeration[theorem]


Is this the right method ?

• What is the expected output for your enumeration? When you show a image with the result from LaTeX it is easier to give you an answer for the ConTeXt setup. – Wolfgang Schuster Aug 1 '18 at 18:44
• I'd also set title=yes, so that you can use \starttheorem[title=Pythagoras Theorem], which is similar to \begin{theorem}[Pythagoras Theorem] in LaTeX. – Aditya Aug 2 '18 at 2:55

You don't want to have the --- in the numberstopper because then it will appear in the cross-references to that theorem as well. Instead you want to use headcommand to add the dash between the title and the contents. Additionally we want to set distance=none because I added the spacing in headcommand already. Since you set prefixsegments=chapter, I guess you also intended to use way=bychapter (instead of bysection).

\setupenumerations
[before={\blank},
after={\blank},
text=Théorème,
alternative=serried,
title=no,
distance=none,
prefix=yes,
prefixsegments=chapter,
way=bychapter,
numberstopper={.},
titlestyle=bold,
style=italic,

\defineenumeration[theorem]

\starttext

\startchapter[title={First}]

\starttheorem[reference={thm:knuth}]
\input knuth
\stoptheorem

\starttheorem
See \in{Theorem}[thm:knuth]
\input ward
\stoptheorem

\stopchapter

\startchapter[title={Second}]

\starttheorem
\input zapf
\stoptheorem

\starttheorem
\input tufte
\stoptheorem

\stopchapter

\stoptext


• Thank you very much Henri. Is it possible to have Theorem 1.1 instead of Theorem 1.1. ? – Fabrice Aug 1 '18 at 23:21
• @Fabrice Of course, just remove the numberstopper={.} (I thought you put it there, which is why I left it there). – Henri Menke Aug 2 '18 at 0:41