I want to have two equation counter format for normal equations in text and in footnote as follows:

enter image description here

I think best way is to redefine footnote equations, but I don't know how do it. Any help would be greatly appreciated.


  • 1
    Please give a use case for wanting to assign a number to a displayed equation in a footnote.
    – Mico
    Commented Feb 15, 2017 at 13:51
  • \footnote is no environment and is this really useful, to hide 'important' equations in footnotes?
    – user31729
    Commented Feb 15, 2017 at 13:52
  • for example F.thesection
    – user108724
    Commented Feb 15, 2017 at 13:54

1 Answer 1


I doubt the usefulness of a specific counter for equations in a footnote (or numbered equations in a footnote at all), but here's a quick hack, by hijacking the \footnote code and temporarily setting the \c@equation and \theequation macros to \c@footequation and \thefootequation, in a group.







  E=mc^{2} \label{foo}

See \eqref{footeq}

Some text\footnote{\begin{equation}E=mc^{2}\label{footeq}\end{equation}}

  c^{2}=a^{2} + b^{2} \label{pythagoras}

Some text\footnote{\begin{equation} c^{2}=a^{2} + b^{2}\label{footpythagoras}\end{equation}}


enter image description here


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