Subequations in one line (no individual references)

Question

I use the following packages already:

\usepackage{a4wide}
\usepackage{fancyhdr}
\usepackage{graphicx}
\usepackage[english]{babel}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage[bookmarks]{hyperref}
\usepackage{braket}
\usepackage{mathrsfs}
\usepackage{mathtools}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsmath}
\usepackage[numbers]{natbib}
\usepackage{scalerel}
\usepackage{stackengine}
\usepackage{enumitem}
\usepackage{hyperref}
\usepackage{alltt}
\usepackage[multiple]{footmisc}

The relevant code so far is:

\begin{subequations}
\label{CanCommRelat}
\begin{align}
[ x_{i} ; x_{j} ] & = 0, \quad
\end{align}
\begin{align}
[ p_{i} ; p_{j} ] & = 0, \text{ and} \quad
\end{align}
\begin{align}
[ x_{i} ; p_{j} ] & = i \hbar \delta_{ij}
\end{align}
\end{subequations}

This numbers the subequations as intended, but I want them to be displayed in the same line. I realize, right now the \quad commands don't have any effect, but I would like the subequations to be separated by a bit of horizontal space each. All I could find were questions of how to put subequations in the same line WITH individual references, which I don't need. I would be nice to be able to reference the expression as a whole.

I suspect the packages I loaded already provide that possibility, but I'm just new to Latex.

Answer 1

You wrote,

This numbers the subequations as intended, but I want [the subequations] to be displayed in the same line.

Something like this?

This solution works by placing three equation (not align) environments into three separate minipage environments.

Addendum, prompted by @Schrödinger'scat's follow-up comment: (a) For a general reference on employing minipage environments to typeset separate (sub)equations and their associated equation numbers, see this posting. (b) If there's text before and/or after this subequations environment, be sure to insert paragraph breaks (best by leaving blank lines) as well.

\documentclass{article}
%\usepackage{a4wide} % is obsolete, use 'geometry' instead
\usepackage[a4paper,margin=2.5cm,includehead]{geometry}
\usepackage{fancyhdr}
\usepackage{graphicx}
\usepackage[english]{babel}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
%\usepackage[bookmarks]{hyperref}% load this package *last*
\usepackage{braket}
\usepackage{mathrsfs}
\usepackage{mathtools}
%\usepackage{amsfonts}% is loaded by 'amssymb'
\usepackage{amssymb}
%\usepackage{amsmath} % is loaded by 'mathtools'
\usepackage[numbers]{natbib}
\usepackage{scalerel}
\usepackage{stackengine}
\usepackage{enumitem}
\usepackage{alltt}
\usepackage[multiple]{footmisc}
\usepackage[bookmarks]{hyperref}

\begin{document}

\begin{subequations}
\label{CanCommRelat}
\begin{minipage}[t]{0.28\textwidth}\begin{equation}
  [ x_{i} ; x_{j} ] = 0, 
\end{equation}\end{minipage}\hfill
\begin{minipage}[t]{0.28\textwidth}\begin{equation}
  [ p_{i} ; p_{j} ] = 0, 
\end{equation}\end{minipage}\hfill
\begin{minipage}[t]{0.34\textwidth}\begin{equation}
  \text{and }[ x_{i} ; p_{j} ] = i \hbar \delta_{ij}.
\end{equation}\end{minipage}
\end{subequations}

\end{document}