equations
I would like to present the below equation using equation numbers. But it does not show it in the pdf file. Has anybody an idea? Thanks
\[ \varphi(x,y) =
\begin{cases} \label{ch:five:sec:5:eq4:1}
1 & if \quad |I(x,y) - \overline{I(x,y)}|> JND_{ST}(x,y), \\
0 & \quad \quad \quad otherwise \\
\end{cases}
\]
A solution with small bullets, and your code simplified, using the nccmath , relsize and braket packages. I patched the definition of the \Set command thanks to David Carlisle to improve the spacing of the braces.
Note that "discr" is actually a math operator, and I declare it as such, in order to have better horizontal spacings.
\documentclass[11pt, a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[textwidth = 15cm]{geometry}
\usepackage{lmodern, amssymb}
\usepackage{mathtools}
\usepackage{braket, relsize, nccmath}
\renewcommand\Set[1]{%
\csname Set \endcsname{\mskip-\medmuskip#1\mskip-\medmuskip}}%
\DeclareMathOperator{\disc}{disc}
\pagestyle{empty}
\begin{document}
\begin{equation}
V_{p}=\Set{%
F\in\Phi | %
\begin{medsize}\begin{array}{@{\mathsmaller{\bullet}\enspace}l@{}}
p^2 \nmid \disc(F) \quad \text{if}\enspace p \neq 2\\[1ex]
\disc(F)\equiv 1\pmod 4 \vee \disc(F)\equiv 8\vee 12
\pmod{16} \quad\text{if} \enspace p =2
\end{array}\end{medsize}
}%
\end{equation}
\end{document}
Just reset \rmdefault to the definition it had before mathpazo was loaded.
\documentclass{article}
\let\temp\rmdefault
\usepackage{mathpazo}
\let\rmdefault\temp
\begin{document}
The quick brown fox jumps over the lazy dog.
\[
\int_a^b f(x) dx
\]
\end{document}
Best Answer
It's not
\labelthat generates the equation number: use theequationenvironment instead.