Hi Xan,
Thanks to your example and Aditya's explanantion I learned too…
I'm glad for that :-)
Here is how you can get what you want:
%%% begin example
\defineenumeration[lemma]% [text={Lemma}, headstyle=bold, between=\blank, titledistance=0em, textdistance=1em, stopper={.\space}, location=serried, left={\bgroup\bf}, right={\egroup}, width=fit, style=italic, title=yes, titledistance=.3em, titlestyle=sc] % or italic, or whatever you like
I think titledistance=1ex is better spacing. I don' t know what is exactly the space between number and (). What width has space?
\starttext
\startlemma[reference]{ A brilliant result} If $a=2$ then the set $H(a)$ is not empty. \stoplemma
\stoptext
%%% end example
Best regards: OK
Thanks to you, Otared. Xan.