pdfx problem with double \tilde

Question

My question may not be far away from this one here: pdfx problem with embedding the pigpen font (?) but I didn't really find an answer to mine so here it comes:

I want to produce a PDF/A compliant pdf-file out of my thesis using LaTeX for the sake of publishing. It seems that LaTeX has problems with the pdfx-package and double tildes. Here is my MWE:

\documentclass{article}

\usepackage{amsmath,amssymb}

\usepackage[a-1b]{pdfx}


\begin{document}
Here is a math symbol with double tilde: $\tilde{\tilde{h}}$.
\end{document}

When I compile this with pdfLaTeX, I get the error message

! Undefined control sequence.
\macc@adjust ->\dimen@ \macc@kerna 
                                   \advance \dimen@ \macc@kernb \kern -\dimen@ 
l.9 ...ymbol with double tilde: $\tilde{\tilde{h}}
                                                  $.

Note that I have to use the double \tilde's here since for publishing, the printed version must be identical to the pdf-version.

Now I tried to solve the problem by replacing \tilde by \widetilde and it worked, but I would feel much more comfortable if I have a solution that also works with \tilde. Can somebody help?

Thanks,

Martin

Answer 1

pdfx patches an amsmath command, but as amsmath has changed it now breaks. You should report this. As a work-around you can undo the patch:

\documentclass{article}

\usepackage{amsmath}
\usepackage{amssymb}
\usepackage[a-1b]{pdfx}

\makeatletter
\AtBeginDocument{\let\mathaccentV\AMS@mathaccentV}
\makeatother
\begin{document} 
Here is a math symbol with double tilde:  $\tilde{\tilde{h}}$.
\end{document}