I want to have the footnotes in the footer and I implemented this solution from Aram Becker.
MWE:
\documentclass[a4paper,10pt,oneside]{report}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[hidelinks]{hyperref}
\usepackage[bottom]{footmisc}
\usepackage[bmargin=1.4cm,tmargin=1.5cm,hmargin=2cm,headsep=0.3cm,footnotesep=0cm,footskip=0.6cm]{geometry}
\usepackage{fancyhdr,lipsum}
\renewcommand{\footrulewidth}{0.4pt}
\fancyhead[L]{\nouppercase{\leftmark}}
\fancyhead[R]{\nouppercase{\rightmark}}
\let\origfootrule\footrule
\renewcommand{\footrule}{\iffootnote{}{\origfootrule}}
\renewcommand\footnoterule{\origfootrule}
\begin{document}
\chapter{test}
\pagestyle{fancy}
\lipsum[1-15]
test \footnote{\lipsum[1-8]}
\lipsum[1-15]
\end{document}
As you can see, the footnote overflows on the next page but stop overflowing after (if you change the length of the lipsum in the footnote), so it is like it's capped only for the footnote's page.
\interfootnotelinepenalty=10000. If your footnote contains paragraphs you will have to suppress breaks there too. And personnally I wouldn't put an equation in the footnote. My footnotes are rarely longer than one or two lines. – Ulrike Fischer Apr 26 '23 at 16:31\lipsum*[1-8]to see the difference. – Ulrike Fischer Apr 26 '23 at 16:43