I have opened a ticket and can confirm the bug. If you put a normal
Theorem BEFORE the Theorem*, then the problem goes away. But not if the
Theorem comes AFTER the Theorem*. Weird.
https://www.lyx.org/trac/ticket/13356
Riki
On 8/19/26 1:25 AM, Rene Adad wrote:
Hello,
I have found a regression in LyX 2.5.2 affecting unnumbered (starred)
theorem environments.
Steps to reproduce:
1.
Create a new document using the AMS Article class.
2.
Add the “Theorems (AMS)” module.
3.
Insert a paragraph using the “Theorem*” layout.
4.
Enter some text, for example: “This is a test.”
5.
View or export the document as PDF.
Expected result:
|Theorem. This is a test.|
With French as the document language:
|Théorème. Ceci est un test.|
Actual result:
|. This is a test.|
Only the punctuation following the theorem heading is displayed. The
heading itself is missing.
The generated LaTeX contains:
|\providecommand\theoremname{} \theoremstyle{plain}
\newtheorem*{thm*}{\protect\theoremname}|
Consequently, amsthm prints only the punctuation associated with the
empty theorem name.
This appears to be a regression related to the fix for ticket #13307.
In LyX 2.5.1, |theorems-starred.inc| contained a language preamble
such as:
|\providecommand{\theoremname}{_(Theorem)}|
The LyX 2.5.2 change removed these explicit |LangPreamble| definitions
and now constructs theorem names from the layout information. However,
the starred theorem layouts do not appear to define a
|TheoremCrossRefName|. As a result, the generated fallback name is empty.
Numbered theorem environments appear to be unaffected because their
layouts do define |TheoremCrossRefName|.
The same problem is likely to affect the other starred environments,
such as |Lemma*|, |Proposition*|, |Corollary*|, and so on.
A document-level workaround is:
|\providecommand{\theoremname}{Theorem}|
or, for a French document:
|\providecommand{\theoremname}{Théorème}|
Environment:
*
LyX 2.5.2
*
macOS
*
Official Qt 6 universal build
*
Reproduced with the “Theorems (AMS)” module and the |Theorem*| layout
Could you please confirm whether this should be opened as a new
regression ticket?
Best regards,
--
----------------------------
Richard Kimberly (Riki) Heck
Professor of Philosophy and Professor of Linguistics
Brown University
Pronouns: they/them/their
Website:http://rkheck.frege.org/
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