Set the counter for multiple equations of the same kind

Question

I want equations (2) and (3) to be labeled as (1a) and (1b)

\documentclass[12pt,a4paper,table,usenames, dvipsnames]{book}
\usepackage[table]{xcolor}
\definecolor{def}{RGB}{66,103,178}
\usepackage{empheq}
\usepackage[most]{tcolorbox}
\newtcbox{\mymath}[1][]{%
nobeforeafter, math upper, tcbox raise base,
enhanced, colframe=blue!30!black,
colback=def!20, boxrule=1pt,
#1}

\begin{document}

Some text…
\begin{empheq}[box={\mymath[colback=Bittersweet!20]}]{equation}
(x-x_0)^2+(y-y_0)^2+(z-z_0)^2=R^2
\end{empheq}

Some text…
\begin{empheq}[box={\mymath[colback=Bittersweet!20]}]{equation}
x^2+y^2+z^2+Ax+By+C z=0
\end{empheq}

Some text…
\begin{empheq}[box={\mymath[colback=Bittersweet!20]}]{equation}
x^2+y^2+z^2=R^2
\end{empheq}

\end{document}

Welcome to TeX SX! This is not clear at all. What would you like to have, precisely? — Bernard, Jan 22 '19 at 19:47
Welcome to TeX.SX! As Bernard says it is not at all clear what you want to do. Further, can you please expand the code snippet that you have posted to a full minimal working example. A MWE should compile and be as small as possible to demonstrate your problem. it's much easier to help you if we have full working code to start from. — , Jan 22 '19 at 21:17
environment subequations from asmath package is your friend — Zarko, Jan 23 '19 at 00:44
Possible duplicate: How to reference equations using letters and numbers (due to the accepted answer) — Werner, Jan 23 '19 at 01:28

score 2 · Answer 1 · answered Jan 23 '19 at 00:51

see if the following example gives what you looking for:

documentclass[12pt,a4paper,table,usenames, dvipsnames]{book}
\usepackage[table]{xcolor}
\definecolor{def}{RGB}{66,103,178}
\usepackage{empheq}% it call `amsmath
\usepackage[most]{tcolorbox}
\newtcbox{\mymath}[1][]{%
nobeforeafter, math upper, tcbox raise base,
enhanced, colframe=blue!30!black,
colback=def!20, boxrule=1pt,
#1}

\begin{document}

Some text…
\begin{subequations}\label{eq:my equations}  % <---
\begin{empheq}[box={\mymath[colback=Bittersweet!20]}]{equation}
(x-x_0)^2+(y-y_0)^2+(z-z_0)^2=R^2
\end{empheq}

Some text…
\begin{empheq}[box={\mymath[colback=Bittersweet!20]}]{equation}
x^2+y^2+z^2+Ax+By+C z=0
\end{empheq}

Some text…
\begin{empheq}[box={\mymath[colback=Bittersweet!20]}]{equation}
x^2+y^2+z^2=R^2
\end{empheq}
\end{subequations} % <---

\end{document}

@DimitriosSykias, than you can accept this answer with clicking on check mark at top left side of answer :-) — Zarko, Jan 23 '19 at 09:32

Set the counter for multiple equations of the same kind

1 Answers1