LyX Cross Referencing in Different Language not working

Question

I'm having troubles using the cross referencing system with LyX (version 2.1.1). I place labels on the side of the environment i want to be able to make reference in the future, using the label function from gui. When i want to add a reference i use the reference function from gui. I choose the lable i want and, since i don't want just the numbers but also the environment name (e.g. : Section, Theorem, ecc..), i also select "Formatted reference".

I'm using ams classes since i need to input math. In particular, from Document > Settings > Modules i choose "Theorems (AMS, Numbered by Type), Theorems (AMS Extended, Numbered by Type), Theorems (Numbered by Type Within Sections)", plus others which have nothing to do with math (e.g. fixcm). I'm also editing a document in Italian language, so i want references to be labled in Italian. Keep in mind that in the Lyx editor and in pdf i see correctly translated names for all the environments. The problems comes up only in cross referencing.

The problem is that if i make reference to a Theorem i get the label automatically placed, but in english (Theorem unstead of teorema). If i reference a Definition, i get nothing apart the numbers.

Seems that the problem with the appearance of only some kinds of evironment lables is common but trying some of the solutions proposed seems not to work for me. For instance, adding the following:

\newcommand{\figref}[1]{Figure~\ref{#1}}
\newcommand{\tabref}[1]{Table~\ref{#1}}
\newcommand{\eqnref}[1]{Eq.~\ref{#1}}
\newcommand{\secref}[1]{Section~\ref{#1}}
\newcommand{\defref}[1]{Definition~\ref{#1}}

will give error, since LyX seems to add some kind of definition to be able to manage the only working lables (Theorems, Lemma, Section), by adding hte following:

\AtBeginDocument{\providecommand\thmref[1]{\ref{thm:#1}}}

\RS@ifundefined{subref}
  {\def\RSsubtxt{section~}\newref{sub}{name = \RSsubtxt}}
  {}
\RS@ifundefined{thmref}
  {\def\RSthmtxt{theorem~}\newref{thm}{name = \RSthmtxt}}
  {}
\RS@ifundefined{lemref}
  {\def\RSlemtxt{lemma~}\newref{lem}{name = \RSlemtxt}}
  {}

Any suggestions? Am i using LyX the wrong way? Any help will be appreciated.

Answer 1

The way LyX decides what to put in front of a formatted reference is by what label the thing has e.g. if you make a formatted reference to "thm:clever-result" then it will be formatted with "Theorem" at the front (even if the label's in a lemma!). So you need to make sure that the appropriate prefix is in each of your labels. With theorems, LyX puts "thm:" at the start of each label by default, but for historical reasons it doesn't put anything at the start of definitions, so you need to do that yourself. I believe that the correct prefix is "defn:" but you'll need to try it and see.

I think the language of the prefixes is decided by the language of the document: in the document settings, choose the language page and you can change it there. This ought to the same as the language used for the text used when you create the theorems.

Answer 2

I just found a way to personalise the way LyX presents formatted references, I'm on version 2.2.2 so you millage may vary, it involves 3 steps, I did it for figures,

1. First make sure to check Use refstyle (not prettyref) ... in Document -> Settings -> Document Class.
2. Reference a figure with formatted reference, lets say the caption is fig:my-figure, then LyX will create a \figref{my-figure} without the fig:.
3. Add \renewcommand{\figref}[1]{Fig.~\ref{fig:#1}} to the document's LaTeX preamble, notice that we consider the fig: lost in the last step. And also, notice that you can change the Fig.~ for watever meets your needs for instance \renewcommand{\figref}[1]{Figura~\ref{fig:#1}} if you're working in Spanish.

If you delete all figure formatted references from the document, you should delete the \renewcommand from the document's LATeX preamble, otherwise it won't compile.

Note:

In order to prevent the LyX commands for formatting to run after your own commands you can wrap them with \AtBeginDocument{...}, for example:

\AtBeginDocument{\renewcommand{\eqref}[1]{Eq.~(\ref{eq:#1})}}