boldequationsnumberingtext-decorations
I need the numbers of equations and brackets around to be in bold.
Doing like this
\usepackage{etoolbox}
\pretocmd{\theequation}{\bf}{}{}
only the number is produced in bold, how to bold brackets?
And second question. I want my references to equations also to be with bolded brackets automatically, how to do this?
Looks like \numberwithin is not meant to be used the way you are trying to use it. (I'm surprised too!) The problem is that it essentially does two things:
\renewcommand*\the<slave counter>{\the<master counter>.\arabic{slave counter}}\@addtoreset{<slave counter>}{<master counter>}The second one is what change the numbering. Notice that it is "addtoreset". Which means that it will make the increment operation on the master counter trigger a reset of the slave counter. So after calling \numberwithin{equation}{section}, the trigger has been laid. And a second call of \numberwithin{equation}{chapter} does not remove the previous trigger. Therefore the equation counter will still be reset everytime the section counter increases.
So much for why it does what you see that it does. For a solution, clearly you must stop using the convenient \numberwithin command. A substitute is the \counterwithin and \counterwithout commands provided by the chngcntr package.
So you should define, in your preamble, the following commands:
\usepackage{chngcntr}
\newcommand*\startappendixeqnumbering{%
\counterwithout{equation}{chapter}%
\counterwithin{equation}{section}%
\renewcommand*\theequation{\thechapter.\thesection.\arabic{equation}}}
\newcommand*\startnormaleqnumbering{%
\counterwithout{equation}{section}%
\counterwithin{equation}{chapter}%
\renewcommand*\theequation{\thechapter.\arabic{equation}}}
\counterwithin{equation}{chapter} %Set the default
And call \startappendixeqnumbering before the first appendix and \startnormaleqnumbering after the last appendix, before the start of the next chapter.
Looking at the code, I can see lots of places where \tagform@ is used and presumably the code for equation uses one explicitly instead of \print@eqnum. Guessing completely here, I would say that \print@eqnum is used when amsmath has to read in the whole equation and typeset it out again carefully (to get the alignment right). Since equation doesn't involve any fancy alignment, it can be processed directly and as a consequence the tag is written using \tagform@ directly.
How about going for the opposite direction? Modify \tagform@ to be what you want it to be and then change \eqref so that it uses the original.
\documentclass{article}
\usepackage{amsmath}
\makeatletter
\let\mytagform@=\tagform@
\def\tagform@#1{\maketag@@@{\bfseries(\ignorespaces#1\unskip\@@italiccorr)}\hspace{3mm}}
\renewcommand{\eqref}[1]{\textup{\mytagform@{\ref{#1}}}}
\makeatother
\begin{document}
\begin{equation}
1+1=2\label{equation}
\end{equation}
\begin{align}
1+1 &= 2\label{align}
\end{align}
\eqref{equation}, \eqref{align}
\end{document}
Result:
(Note added in edit: Barbara Beeton has asked me to add a comment to the effect that the AMS redefinition of the equation environment is meant to keep it looking as the original but with a check for if the \qed symbol should be added. Also, eqnarray appears to be a bit of a minefield in its definition so Things May Go Wrong if you use eqnarray!)
Best Answer
You can redefine
\tagform@#1fromamsmath.sty: