I have just been using the default label and reference formats, i.e. $\label{eqn:a}$ and \ref{eqn:a} but I was wondering if there's a way to change the format of the references. For example if I am referring back to Theorem 1.1 $\label{thm:1.1}$ using \ref{thm:1.1} it shows in the .pdf file as simply 1.1.
I would like my references to say more than the number, i.e. to say Theorem 1.1 in the .pdf (I would also like this to be true for my Definitions and Lemmas). Obviously I know that this doesn't make sense for a line in a proof but is there a way to change the format when you are referring to a labelled theorem(or definition/lemma/etc.)??
[Tex/LaTex] How to change label/reference formats
citingcross-referencinglabels
Related Solutions
The behaviour you describe comes from the standard LaTeX \newtheorem command; the problem can be solved by using the amsthm or ntheorem packages:
\documentclass{article}
\usepackage{amsthm}
\usepackage{cleveref}
\newtheorem{thm}{Theorem}[section]
\newtheorem{lemma}[thm]{Lemma}
\newtheorem{cor}[thm]{Corollary}
\begin{document}
\begin{thm}\label{thm:test}
test
\end{thm}
\begin{lemma}\label{lem:test}
test
\end{lemma}
As shown in \cref{thm:test} and \cref{lem:test}
\end{document}
The \newtheorem commands have to come after the loading of cleveref.
Additionally, the cleverref package has to be loaded after ntheorem or amsthm.
In total this gives the following order:
\usepackage{ntheorem}
\usepackage{cleveref}
\newtheorem{...}
By the way, the plural forms of theorem and lemma don't use an apostrophe, so you should use
\crefname{thm}{theorem}{theorems}
\crefname{lemma}{lemma}{lemmas}
Add to the document preamble (Document --> Settings --> LaTeX preamble)
\newref{claim}{name=claim~}
and it will probably work. As mentioned by egreg in the comments, the refstyle package is used, and you have to tell it what it should insert for labels starting with claim:.
refstyle also provides commands for start-of-sentence references (capital letter) and plural forms, and the words to insert in these cases can also be specified, e.g.
\newref{claim}{name=claim~,Name=Claim~,names=claims~,Names=Claims~}
I don't know, however, how to make LyX use these, other than through using an ERT, with e.g. \Claimref{claim:1}. See the refstyle documentation for details.
Example
Copy the following code to an empty file and save as a .lyx file, e.g. example.lyx. Open in LyX and compile. Screenshots of LyX view and PDF below.
#LyX 2.0 created this file. For more info see http://www.lyx.org/
\lyxformat 413
\begin_document
\begin_header
\textclass article
\begin_preamble
\newref{claim}{name=claim~}
\end_preamble
\use_default_options true
\begin_modules
theorems-bytype
theorems-sec-bytype
\end_modules
\maintain_unincluded_children false
\language english
\language_package default
\inputencoding auto
\fontencoding global
\font_roman default
\font_sans default
\font_typewriter default
\font_default_family default
\use_non_tex_fonts false
\font_sc false
\font_osf false
\font_sf_scale 100
\font_tt_scale 100
\graphics default
\default_output_format default
\output_sync 0
\bibtex_command default
\index_command default
\paperfontsize default
\spacing single
\use_hyperref false
\papersize default
\use_geometry false
\use_amsmath 1
\use_esint 1
\use_mhchem 1
\use_mathdots 1
\cite_engine basic
\use_bibtopic false
\use_indices false
\paperorientation portrait
\suppress_date false
\use_refstyle 1
\index Index
\shortcut idx
\color #008000
\end_index
\secnumdepth 3
\tocdepth 3
\paragraph_separation indent
\paragraph_indentation default
\quotes_language english
\papercolumns 1
\papersides 1
\paperpagestyle default
\tracking_changes false
\output_changes false
\html_math_output 0
\html_css_as_file 0
\html_be_strict false
\end_header
\begin_body
\begin_layout Section
Something
\end_layout
\begin_layout Claim
\begin_inset CommandInset label
LatexCommand label
name "claim:claim1"
\end_inset
I hereby claim that I don't use LyX.
\end_layout
\begin_layout Theorem
\begin_inset CommandInset label
LatexCommand label
name "thm:1"
\end_inset
LyX makes some things harder.
\end_layout
\begin_layout Standard
Inserting references:
\begin_inset CommandInset ref
LatexCommand formatted
reference "thm:1"
\end_inset
and
\begin_inset CommandInset ref
LatexCommand formatted
reference "claim:claim1"
\end_inset
.
\end_layout
\end_body
\end_document
Best Answer
A possibility is to use
cleverefand its\crefor\Crefcommands to include the type of the referenced counter, e.g. an equation or a theorem. The\Crefis used for uppercase purposes, e.g. at the beginning of a sentence.Please note, that
\usepackage[english]{cleveref}etc. is perhaps more useful, depending on the needed language.cleveref's output format for references can be reconfigured using\crefformatetc.cleverefshould be the last package be loaded here!