[texhax] Bug in amsmath: footnote in intertext

[Barbara Beeton]

On Wed, 14 Nov 2012, Victor Ivrii wrote:

    Thanks!

    Yes, it works and the label should be placed in \footnotetext. Still this
    looks like a bug, not a feature!

i will put this on the list of amsmath features
to be investigated, but i believe it will in
the end be declared a feature.  the multi-line
alignments in amsmath must all be stored in
boxes in order to perform necessary calculations
(width, and whether or not -- and where -- there
is space for equation numbers), and it's a
feature of tex itself that footnotes get "lost"
when issued in a box.

\footnotemark / \footnotetext is the strategy
we recommend to authors who need to use such
methods.
						-- bb

    Victor
    
    
    On Wed, Nov 14, 2012 at 3:31 AM, Herbert Voss <Herbert.Voss at fu-berlin.de>wrote:
    
    > Am 14.11.2012 09:23, schrieb Victor Ivrii:
    >
    >  Footnote itself does not appear (but footnotemark appears in the text)
    >>
    >
    > use \footnotemark/\footnotetext:
    >
    >
    > \documentclass[12pt]{article}
    > \usepackage{amsmath}
    > \begin{document}
    >
    > \begin{align}
    > 1+1=2
    > \intertext{we know this\footnotemark}
    > 2+2=4
    > \end{align}
    > \footnotetext{because we are smart.}
    >
    > \end{document}
    >
    >
    > Herbert