[Tex/LaTex] How to cross-reference theorems with “Theorem”

cross-referencingtheorems

I use

\begin{lemma} \label{aaa} ... \end{lemma}
\begin{theorem} \label{bbb} ... \end{theorem}

and many other similar kinds in the same document.

When I cross-reference those lemmas and theorems somewhere in the manuscript, I don't remember if I named it a lemma or a theorem, but I perhaps remember the label name. When I just \ref{aaa}, it only gives the number; so I have to put something like Lemma \ref{aaa} or Theorem \ref{bbb}. How can I print "Lemma 1" when it is a lemma, and "Theorem 2", when it is a theorem, without explicitly typing "Lemma" and "Theorem"?

Best Answer

hyperref's \autoref function does this for you. It's neat. I believe there's also ntheorem's \thref and the theoremref package. And finally, there is the cleveref package.

To get custom names with hyperref you need to add \newcommand{\xxxautorefname}{Xxx}, e.g.:

\newcommand{\definitionautorefname}{Definition}
\newcommand{\lemmaautorefname}{Lemma}
\newcommand{\remarkautorefname}{Remark}
\newcommand{\propositionautorefname}{Proposition}
\newcommand{\exampleautorefname}{Example}
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