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The code below creates a chapter with capital I as chapter "number".

\documentclass{book}

\begin{document}

\setcounter{chapter}{8}%
\renewcommand{\thechapter}{\Alph{chapter}}%
\chapter{Introduction}

\begin{equation}
    e = mc^2
\end{equation}

\end{document}

And hence all equations in the chapter will be numbered as I.x (x being the number of the equation in the chapter).

captial I equation

I would prefer that in equations the I would however not be capitalized, e.g.:

normal i equation

I it possible to do this without changing the chapter numbering (I want to keep that capitalised).

Thanks!

3
  • 1
    \renewcommand\theequation{\alph{chapter}.\arabic{equation}}
    – daleif
    Aug 18, 2020 at 16:08
  • This works! Thanks a lot! btw: when you switch back to arabic chapter numbering, you should once again renew the equation numbering \renewcommand\theequation{\arabic{chapter}.\arabic{equation}}
    – Joost
    Aug 18, 2020 at 16:12
  • I think it would book better with scroman numbering of chapters (in equations).
    – Bernard
    Aug 18, 2020 at 16:56

1 Answer 1

2

It is as simple as

\renewcommand\theequation{\alph{chapter}.\arabic{equation}}

Normally this definition contains \thechapter but one can do what ever

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