Other footnote-kinds

Question

I'd like to create these kinds of footnotes:

1. The numbers between (), [], {};
2. The numbers in circles and boxes;
3. Footnotes in $...$, $$...$$, \begin{equation}...\end{equation}-and-\begin{tabular}...\end{tabular}--environments.

How could I do?

Thank you

Answer 1

You can create different types of footnote using the manyfoot package. If you want a special type of footnote to use in equations, then you can use two types and \ifmmode to test whether you are currently in math mode. Personally, I would advise against using footnotes in equations, since the symbol or number can easily be mistaken for a piece of mathematical notation. Nevertheless...

\documentclass{article}
\usepackage{manyfoot}

\newcounter{footnoteA}
\newcommand\footnoteA{%
\stepcounter{footnoteA}%
\Footnotemark\thefootnoteA \FootnotetextA{}}

\newcounter{footnoteB}
\newcommand\footnoteB{%
\stepcounter{footnoteB}%
\Footnotemark\thefootnoteB \FootnotetextB\thefootnoteB}

\renewcommand{\thefootnoteB}{[\#\roman{footnoteB}]}

\newcommand\myfootnote[1]{\ifmmode\footnoteB{#1}\else\footnoteA{#1}\fi}

\newfootnote{A}
\newfootnote{B}
\usepackage{lipsum} %For dummy text
\begin{document}
\lipsum[1]\footnoteA{The quick brown fox jumps over the lazy dog}
\lipsum[2]\footnoteB{but lands on a sharp spike}
\lipsum[3]\myfootnote{and dies}
\[
e = mc^2\myfootnote{His advice from beyond is to avoid footnotes in equations.}
\]
\end{document}

The code for creating \footnoteA and \footnoteB is taken from the manyfoot package documentation.

Answer 2

I've found the solution for

1. \renewcommand{\thefootnote}{(\arabic{footnote})}; \renewcommand{\thefootnote}{[\arabic{footnote}]}; \renewcommand{\thefootnote}{{\arabic{footnote}}};

2. Not yet for circle; \renewcommand{\thefootnote}{\boxed{\arabic{footnote}}}

3. Not yet

When someone will find a solution, please edit this message! Thank you so much.