Hallo,
there seems to be a bug in LyX version 2.1.3:
When importing a TeX file, LyX deletes the caption from \newtheorem.
For example, import the file below with:
File -> Import -> LaTeX (plain)... -> test_import.tex
Then control the settings with:
Document -> Settings... -> LaTeX Preamble
This gives:
\newtheorem{theorem}{}[section]
That is, the second argument "{Theorem}" of \newtheorem has been
replaced by "{}".
The import worked correctly under the version 2.0.6 which I had before.
(Operating system: Windows 8.1, 64 bit).
Yours,
Johannes Schmid
---------------- Example file test_import.tex -------------------------
%% LyX 2.1.3 created this file. For more info, see http://www.lyx.org/.
%% Do not edit unless you really know what you are doing.
\documentclass[12pt,a4paper]{article}
\usepackage[latin9]{inputenc}
\makeatletter
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% LyX specific LaTeX commands.
\special{papersize=\the\paperwidth,\the\paperheight}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% User specified LaTeX commands.
\newtheorem{theorem}{Theorem}[section]
\makeatother
\begin{document}
This is only for test.
\end{document}
-------------------- End ----------------------------------------------
