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Here's a problem confused me for long time, the minimal executable code is listed below:

\documentclass[UTF8]{article}
\usepackage{amsmath}
\usepackage{lipsum}

\begin{document}
    \lipsum[1]


\begin{equation*}
    A = B\cap C\footnotemark
\end{equation*}
\footnotetext{\lipsum[1]}
orem ipsum dolor sit amet, consectetuer adipiscing elit.  Ut purus elit,vestibulum ut, placerat ac, adipiscing vitae, felis.  Curabitur dictum gravidamauris. Nam arcu libero, nonummy eget, consectetuer id, vulputate a, magna.

\lipsum[1]



\end{document}

the generated result is:

enter image description here

look at the marked area by red color, I find that if I use \footnotetext{}, it would generate about half letter spacing at the beginning of the next line, whereas there's no spacing if I directly use \footnote{}. However, \footnote{} is only useful in equation or equation* environment. I've test for many times, I'm sure it's a spacing.

My question is How to remove the small spacing after \footnotetext{}?

On_My_Way
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    You need a % at the end of this line: \footnotetext{\lipsum[1]}%. Otherwise, you introduce a stray space. See https://tex.stackexchange.com/questions/7453/what-is-the-use-of-percent-signs-at-the-end-of-lines-why-is-my-macro-creat – Steven B. Segletes Apr 30 '21 at 20:34
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    Also, you should not have a blank line before the equation, as it adversely messes with the vertical spacing. – Steven B. Segletes Apr 30 '21 at 20:36
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    I would probably never place a footnote inside or attached to anything math related as it can be misunderstood by the reader. – daleif Apr 30 '21 at 20:38
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    Welcome to tex.sx. A problem you haven't mentioned is the loss of the letter "o" from "orem". ("L" was already absent from the input text, which leads me to believe that the syntax required by \footnotetext isn't correct.) If only the extra space was the problem, that could likely be corrected by inserting a % sign at the end of the preceding line. – barbara beeton Apr 30 '21 at 20:38
  • @barbarabeeton The missing letter is due to the footnote text being \lipsum[1]. Curious. – egreg Apr 30 '21 at 22:23

1 Answers1

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You should think twice before footnoting an equation, because the footnote marker will be most likely be confused with an exponent.

Anyway, the space you see is the effect of the endline after \footnotetext{...}

Fix it with a %:

\documentclass{article}
\usepackage{amsmath}
\usepackage{lipsum}

\begin{document}


\lipsum[1]
\begin{equation}
  A = B\cap C\footnotemark
\end{equation}
\footnotetext{A footnote}% <--- HERE!
\lipsum[1]


\end{document}

The missing first letter in your picture is a curious side effect of \lipsum[1] in the footnote text.

enter image description here

Note that there is no UTF8 option to the document class. Remove it.

egreg
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