# Some equation with number some without into \flalign

I have this:

\documentclass[conference]{IEEEtran}

%Packs
\usepackage{cite}
\usepackage{amsmath,amssymb,amsfonts}
\usepackage{algorithmic}
\usepackage{graphicx}
\usepackage{textcomp}
\usepackage{color,soul} %highlight tool
\usepackage[utf8]{inputenc}

\begin{document}

\begin{flalign}
X_c         &= X_{ASV} & \\
Y_c         &= Y_{ASV} & \\
\theta_c    &= \theta_{ASV}  & \\
s_c         &= 2 Z_{UAV} \tan(\frac{FOV_h}{2})  & \\
la_c        &= \cos(\theta_{UAV}) \Delta_X + \sin(\theta_{UAV}) \Delta_Y & \\
of_c        &=-\sin(\theta_{UAV}) \Delta_X + \cos(\theta_{UAV}) \Delta_Y & \\
\gamma_c    &= \theta_{UAV} & \\
\Delta_X    &= X_{UAV} - X_{ASV} & \\
\Delta_Y    &= Y_{UAV} - Y_{ASV}
\end{flalign}
\end{document}


That code make a number for all equation, is there a way to remove number in the last two equations?

Thank

• Welcome to TeX SX! Yes: add \notag in each of the last two equations. – Bernard Apr 14 at 21:12
• thank! and how to refer to all of them? \eqref{label} just return 1 – Leonardo Garberoglio Apr 14 at 21:21
• You can't refer to the unumbered equations. For the others, you have to add a label to each, such as \label{mylovely equation} and refer it as ‘equation \eqref{mylovelyequation}’. Maybe, also think of the subequations environment. – Bernard Apr 14 at 21:24
• ok, I just want to get: "as show in equation [1-7]" adding a label to the align block, but \eqref using align block label just return "1" – Leonardo Garberoglio Apr 14 at 21:50
• Using package cleveref, you have the \crefrange command. In addition cleveref will type for you the abbreviated word eqs. Furthermore the layout can be customised. – Bernard Apr 14 at 21:56