Reference Lemma from the same document

Question

I am writing a document, where I have 3-4 Theorems, and a Lemma. I want to refer to the Lemma in the Theorems (possibly highlighted and a link to the Lemma). How should I go about doing it? I tried inserting a \label{lma1} in the Lemma, and then using ~\cref{lma1}, but this refers to the Lemma as "Theorem 2.5" (the numbering is right, but I want it to display "Lemma 2.5". How do I change this?

Answer 1

Depending on the theorem package you're using (or if you're doing it without a package), you need to define a separate lemma environment. The following minimal working example uses amsthm to define a theorem and lemma environment. cleveref has been formatted to print Lemma for a lemma reference, while dummy text is provided by lipsum:

\documentclass{article}
\usepackage{amsthm}% http://ctan.org/pkg/amsthm
\usepackage{hyperref}% http://ctan.org/pkg/hyperref
\usepackage{cleveref}% http://ctan.org/pkg/cleveref
\usepackage{lipsum}% http://ctan.org/pkg/lipsum
\newtheorem{theorem}{Theorem}
\newtheorem{lemma}{Lemma}
\crefname{lemma}{Lemma}{Lemmas}
\begin{document}
\section{A section}
\begin{theorem}\label{thm}\lipsum[1]\end{theorem}
\begin{theorem}See~\cref{lma1}.\end{theorem}
\begin{lemma}\label{lma1}\lipsum[2]\end{lemma}
\end{document}