[Tex/LaTex] How to label some lines of a multiline chain of aligned equations

Question

How in LaTeX do I make a multiline chain of equations, aligned on their = signs, and label at least one of them but not all of them, in such a way that equation-references work as they should?

The documentation I've seen addresses the task of laying out a single equation which is too long for a line, but not the task of laying out a chain of equations over several lines, with labels on specific lines.

\documentclass[10pt,a4paper]{article}
\usepackage{amsmath}
\setcounter{equation}{0}
\begin{document}
Text before the equations.
\begin{align*}
f(n+1)&=(n+1)^2 \\\\
&=n^2+2n+1 \label{u} \\\\
&=g(n)+1 \label{v}
\end{align*}
Later I discuss equations \eqref{u} and \eqref{v}.
\end{document}

In searching for the way to do this, I've come across many environments, including align, alignat, aligned, array, equation, eqnarray and various of the above suffixed with *. None of them seem to both compile and work.

Tobias Oetiker's "The Not So Short Introduction to Latex2e", p.64, sect.3.5.2, recommends IEEEeqnarray from the package IEEEtrantools. However my installation of TeX (MiKTeX) doesn't contain IEEEtrantools, and running pdflatex can't find it.

Answer 1

For example using \notag:

\documentclass[10pt,a4paper]{article}
\usepackage{amsmath}
\setcounter{equation}{0}
\begin{document}
Text before the equations.
%\begin{align*}
\begin{align}
f(n+1)&=(n+1)^2 \notag\\
&=n^2+2n+1 \label{u} \\
&=g(n)+1 \label{v}
%\end{align*}
\end{align}
Later I discuss equations \eqref{u} and \eqref{v}.
\end{document}