2

I wrote the following code:

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{amsmath, amssymb, amsfonts}
\usepackage{footnote}
\usepackage[italian]{babel}
\usepackage{soul}
% serve (forse insieme a graphicx) per aggiungere freccia e testo/equazione sopra segno uguale =
\usepackage{mathtools}
% serve per plottare freccia grande, vuota, ruotata (vedi file: quadrato con frecce)

\newcommand{\eqstackrel}[1]{\stackrel{\substack{\mathclap{#1}\\[0.5ex]\displaystyle\uparrow\\ ~}}{ = } }
%serve per aggiungere testo sopra segno uguale =


\title{\textbf{Elementi di Calcolo delle Probabilità}}
\author{}
\date{}

\begin{document}
\maketitle  %serve per stampare il titolo ed eventualmente altro

Ecco del testo\footnote{Ecco una nota al testo.}

\begin{align}
P(R_2 | B_1) &= \left( 1 - P(R_1 | R_2) \right) \frac{P(R_2)}{1 - P(R_1)}
\eqstackrel{P(B | A) = P(B) \quad \text{rel. 126 a pag. 49}}
\\
&= \left( 1 - P(R_1) \right) \frac{P(R_2)}{1 - P(R_1)} \\
&= P(R_2)
\eqstackrel{\text{per hp\footnotemark}}
\\
&= \frac{R}{R + B}
\end{align}
\footnotetext{aaa}


\end{document}

The problem is that the footnote has a wrong number; in particular the previous footnote has the number 1, instead the footnote introduced by footmark has the number 4. How can I fix it?

5
  • 1
    You should put a complete MWE, with the \documentclass, the \usepackage used, etc. so that we could compile directly... Commented Oct 9, 2021 at 16:01
  • Hello @F.Pantigny thank you Commented Oct 9, 2021 at 16:17
  • Not related: You should use \bigl( and \bigr) instead of \left( and \right) in your case. Commented Oct 10, 2021 at 8:17
  • Hi @F.Pantigny what is the difference? Commented Oct 10, 2021 at 8:34
  • 1
    In mathematical notations, when brackets are nested within other brackets, the surrounding brackets must be bigger. Here with \left( and \right), the exterior brackets have the same size as the interior ones. For a good mathematical notation, you have to fix the sizes of the brackets 'by hand'. Commented Oct 10, 2021 at 8:37

2 Answers 2

2

The culprit is \mathclap. I suggest not using \mathclap (but \clap).

\documentclass{article}
\usepackage{amsmath, amssymb, amsfonts}
\usepackage{footnote}
\usepackage[italian]{babel}
\usepackage{mathtools}

\newcommand{\eqstackrel}[1]{\stackrel{\substack{
\clap{$\scriptstyle #1$}\\[0.5ex]\displaystyle\uparrow\\ ~}}{ = } }

\begin{document}
Ecco del testo\footnote{Ecco una nota al testo.}

\begin{align}
P(R_2 | B_1) &= \left( 1 - P(R_1 | R_2) \right) \frac{P(R_2)}{1 - P(R_1)}
\eqstackrel{P(B | A) = P(B) \quad \text{rel. 126 a pag. 49}}
\\
&= \left( 1 - P(R_1) \right) \frac{P(R_2)}{1 - P(R_1)} \\
&= P(R_2)
\eqstackrel{\text{per hp\footnotemark}}
\\
&= \frac{R}{R + B}
\end{align}
\footnotetext{aaa}

\end{document}

Output of the above code


Since you have loaded footnote, I suggest to put the {align} in a {savenotes} and use \footnote directly. However, the command \footnote must not be put in the command \text but just after.

\documentclass{article}
\usepackage{amsmath, amssymb, amsfonts}
\usepackage{footnote}
\usepackage[italian]{babel}
\usepackage{mathtools}

\newcommand{\eqstackrel}[1]{\stackrel{\substack{
\clap{$\scriptstyle #1$}\\[0.5ex]\displaystyle\uparrow\\ ~}}{ = } }

\begin{document}
Ecco del testo\footnote{Ecco una nota al testo.}

\begin{savenotes}
\begin{align}
P(R_2 | B_1) &= \left( 1 - P(R_1 | R_2) \right) \frac{P(R_2)}{1 - P(R_1)}
\eqstackrel{P(B | A) = P(B) \quad \text{rel. 126 a pag. 49}}
\\
&= \left( 1 - P(R_1) \right) \frac{P(R_2)}{1 - P(R_1)} \\
&= P(R_2)
\eqstackrel{\text{per hp}\footnote{aaa}}
\\
&= \frac{R}{R + B}
\end{align}
\end{savenotes}

\end{document}
1
  • thank you very much for your precious help Commented Oct 9, 2021 at 20:21
1

Strictly speaking, this is not an answer to the question but, since the OP searches a way to add explanations to a calculus, I will suggest to use {DispWithArrows} of witharrows. The footnotes are correctly extracted (by use of the package footnote or, if you prefer, footnotehyper).

\documentclass{article}
\usepackage[italian]{babel}
\usepackage[footnote]{witharrows}


\begin{document}
Ecco del testo\footnote{Ecco una nota al testo.}

\begin{DispWithArrows}[fleqn,displaystyle]
P(R_2 | B_1) &= \left( 1 - P(R_1 | R_2) \right) \frac{P(R_2)}{1 - P(R_1)}
\Arrow{$P(B | A) = P(B)$ \\ rel. 126 a pag. 49}
\\
&= \left( 1 - P(R_1) \right) \frac{P(R_2)}{1 - P(R_1)} \\
&= P(R_2)
\Arrow{per hp\footnote{aaa}}
\\
&= \frac{R}{R + B}
\end{DispWithArrows}

\end{document}

Output of the above code

5
  • I like this alternative Commented Oct 10, 2021 at 8:35
  • F.Pantigny is there a way to get the same result but with a single number on the right side? Commented Oct 10, 2021 at 8:46
  • 1
    In nicematrix, you have a environment {WithArrows} which is similar to {aligned} of amsmath. That environment may be inserted in an environment {equation} and you will have only one number. Commented Oct 10, 2021 at 8:57
  • The solution with \usepackage[footnote]{witharrows} has the drawback that you should compile two times the code in order to see the arrows correctly (I tested it in Texmaker) Commented Oct 10, 2021 at 9:46
  • 1
    You are right. However, you won't have to compile twice if you only do a modification of another part of your document. Moreover, there is tools such as latexmk which do the right number of compilations directly. For instance, Overleaf uses latexmk (afaik). Commented Oct 10, 2021 at 9:56

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