beamer: \nameref calls the name of the section instead of the name of the theorem environment

Question

In my LaTeX documents, I am playing with a lot of axioms which I write under a theorem environment, while using the following math packages:

\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}:

I define the axiom environment in the preamble,

\newtheorem{ax}{Fairness axiom}

then in the text I write,

\begin{ax}[name of the axiom]
\label{label of the axiom}
{definition of the axiom}
\end{ax}

To refer to these axioms, I use \nameref{label of the axiom} through the following packages

\usepackage{hyperref}
\usepackage{nameref}

In the article document class, \nameref{label of the axiom} does exactly what I want : a reference to the name of the axiom with an hyperlink to its definition.

But in the beamer class, \nameref{label of the axiom} quits referring to the name of the axiom and refers instead to the name of the section in which the axiom is included.

Do you know why? Is there any way to get the beamer class behaving like the article class in this matter?

Answer 1

Class beamer stores the theorem name in \inserttheoremaddition. That needs to be passed at the right time to nameref:

\makeatletter
\addtobeamertemplate{theorem begin}{%
  \expandafter\NR@gettitle\expandafter{\inserttheoremaddition}%
}{}
\makeatother