Gmail built in pdf viewer omits last symbol in an url, any idea why? [closed]

Question

Using amsrefs, I want to refer to an answer on mathoverflow. That site has automated amsrefs entry creation option. When I use it, everything goes fine, and the pdf file contains correct link. However when I send the file by gmail and open it in gmail with either Chrome or Firefox (latest build, on Windows 10), there is a problem with that link. If I copy it and paste elsewhere it is correct, but if I click on it, I am taken to a wrong address: instead of https://mathoverflow.net/q/313198 I get https://mathoverflow.net/q/31319 which is an entirely different page.

MWE: produce a pdf from

\documentclass{amsart}

\usepackage{amsrefs}

\begin{document}

$\binom nk$

\begin{biblist}
\bib{E}{misc}{
author={Noam D. Elkies (https://mathoverflow.net/users/14830/noam-d-elkies)},
note={URL: https://mathoverflow.net/q/313198 (version: 2018-10-19)}
}
\end{biblist}
\end{document} 

send it to, say, yourself via gmail and open it from within the gmail pdf viewer.

Let me add that with any other math command that I tried in place of that $\binom nk$ the error disappears.

What can I do?

Answer 1

You should use hyperref and \url if you want real links:

\documentclass{amsart}

\usepackage{amsrefs}
\usepackage{hyperref}
\begin{document}

$\binom nk$

\begin{biblist}
\bib{E}{misc}{
author={Noam D. Elkies (https://mathoverflow.net/users/14830/noam-d-elkies)},
note={URL: \url{https://mathoverflow.net/q/313198} (version: 2018-10-19)}
}
\end{biblist}
\end{document}