# [NTG-context] One-off theorem titles

Thu Mar 3 19:07:28 CET 2011

```On Thu, 3 Mar 2011, S Barmeier wrote:

> Currently I am using something like
>
> \defineenumeration[lemma]
>   [location=serried,
>    text=Lemma,
>    style=italic]
>
> to define theorems, lemmas, etc.
>
> Sometimes a theorem or lemma will have its own name (e.g. Yoneda Lemma),
> and I find it slightly cumbersome to write something like
>
> 3.1 Theorem (Yoneda Lemma)
> 3.1 Lemma (Yoneda)
> 3.1 Lemma (Yoneda Lemma)
>
> and was really hoping that
>
> \startlemma[text={Yoneda Lemma}]
>
> would give me the desired
>
> 3.1 Yoneda Lemma
>
> but it doesn't. I would like to keep the whole setup the same and only
> change the text for this instance. Is there any way to implement this
> except for defining a whole new enumeration for one
> theorem/lemma/proposition by
>
> \startenumeration[text={Yoneda Lemma},location= ... ]

@Hans: Does it make sense to redo all the theorem etc using the new
structure code? There is a little difference between

\startsection .... \stopsection

\starttheorem .... \stoptheorem

except that in enumerations the title is optional and there are a few
predefined header styles (location=whatever), and enumerations have a
closesymbol.

That will easily allow:

\startthoerem[text={Yoneda Lemma}]

etc and one will also get the option of setting the list text, bookmarks,
and page marks.