Footnote in align environment on the same page

Question

A follow-up question about Footnote in math mode. When using \footnotemark within the align environment at the end of the page, the footnote appears on the next page. Here's a minimal example. How do I get the footnote to appear on the same page as the footnote mark?

\documentclass[12pt, a4paper]{article}
\usepackage{geometry}
\usepackage{amsmath}

\begin{document}
Title.
\vspace{19cm}
\begin{align}
  1.\footnotemark
\end{align}
\footnotetext{Footnote.}
\end{document}

There is not enough space on the page to display both the align environment and the footnote on one page. See https://tex.stackexchange.com/q/225171/134144 — leandriis, Jan 28 '18 at 21:21
You could force both the equation and the footnote to the next page with the needspace package. — John Kormylo, Jan 29 '18 at 02:08

score 2 · Answer 1 · answered Jan 29 '18 at 19:29

this is cheating. it is a hack. it assumes that this footnote will not be the first in the document.

this has the effect of moving both the display and the footnote to the next page.

(irrelevant, but it's not a good idea to use align for a one-line display.)

\documentclass[12pt]{article}
\usepackage{amsmath}
\begin{document}
Title.
\vspace{19cm}
\footnotetext{Footnote.}
\addtocounter{footnote}{-1}
\begin{align}
  1.\footnotemark
\end{align}
\end{document}

Footnote in align environment on the same page

1 Answers1