# How to implement plural form of cleverref package to reference a system of equations?

Let's consider the following code:

\documentclass[11pt,oneside]{book}
\usepackage{siunitx}
\usepackage[intlimits]{amsmath}
\usepackage{amsfonts}
\usepackage{amsbsy}
\usepackage{fixmath}
\usepackage{mathtools}
\usepackage{empheq}
\usepackage[super]{nth}
\usepackage[%
%dvipdfmx,%dvips,%
%pdfborder = 0 0 1,
baseurl= http://,
]{hyperref}

\usepackage{cleveref}

\begin{document}

\begin{aligned} \label{eqs:system} \frac{d^2 x}{d t^{* 2}} &= \omega^2 x+2 \omega \dot{y}-G\left(\frac{m_1}{r_1^3}\left(x-x_1\right)+\frac{m_2}{r_2^3}\left(x+x_2\right)\right) \\ \frac{d^2 y}{d t^{* 2}} &=\omega^2 y-2 \omega \dot{x}-G\left(\frac{m_1}{r_1^3} y+\frac{m_2}{r_2^3} y\right) \\ \frac{d^2 z}{d t^{* 2}} &=-G\left(\frac{m_1}{r_1^3} z+\frac{m_2}{r_2^3} z\right) \end{aligned}

reference to \Cref{eqs:system}

\end{document}



I need the plural Equations instead of Equation.

Can you show how to set the plural of \Cref ?

The method is explained in the manual of cleveref, section 6 (page 9).

\documentclass[11pt,oneside]{book}
\usepackage{siunitx}
\usepackage[intlimits]{amsmath}
\usepackage{amsfonts}
\usepackage{fixmath}
\usepackage{mathtools}
\usepackage{empheq}
%\usepackage[super]{nth}%?
\usepackage[%
%dvipdfmx,%dvips,%
%pdfborder = 0 0 1,
baseurl= http://,
]{hyperref}

\usepackage{cleveref}

\Crefname{pluralequation}{Equations}{Equations}

\begin{document}

\label[pluralequation]{eqs:system} \begin{aligned} \frac{d^2 x}{d t^{* 2}} &= \omega^2 x+2 \omega \dot{y}-G\left(\frac{m_1}{r_1^3}(x-x_1)+\frac{m_2}{r_2^3}(x+x_2)\right) \\ \frac{d^2 y}{d t^{* 2}} &= \omega^2 y-2 \omega \dot{x}-G\left(\frac{m_1}{r_1^3} y+\frac{m_2}{r_2^3} y\right) \\ \frac{d^2 z}{d t^{* 2}} &= -G\left(\frac{m_1}{r_1^3} z+\frac{m_2}{r_2^3} z\right) \end{aligned}

reference to \Cref{eqs:system}

\end{document}


I removed some harmful \left and \right commands. The package amsbsy is automatically loaded, but you probably are better served with bm.

I commented out nth. Superscripting “th” is bad practice. It was fashionable in the Victorian age, later revived by some unknown developer of a well-known word processing software who probably liked it.

• Thank you very much @egreg. Any suggestions to write the ordinal numbers without using the nth package? Commented Nov 1, 2022 at 18:13
• @Giuseppe The most common usage (except for users of that word processor) is to write first, second, third and so on for small numbers. For larger numbers write 42nd; 100th, 1234th. If you want to refer to the item number n, type $n$th or, maybe, $n\,$th. In this case the superscript would be utterly wrong. Commented Nov 1, 2022 at 21:09