I am writint notes with a lot of partial derivatives. When the function to be differentiated is long the variable am differentiating with respect to (say t),
\begin{equation*}
\pd[2]{}{t}
\end{equation*}
appears as a fraction of the differentiated function. I want to appear directly under the del symbol. Is this possible? Below is my mwe.
\documentclass[b5paper,11pt,fleqn,leqno,parskip=full]{article}
\usepackage[margin=1in]{geometry}
\usepackage{enumerate,mdwlist}
\usepackage{enumitem}
\usepackage{amsmath,amssymb,amsthm} %[fleqn]
\usepackage{paralist} % for 'inparaenum' environment\newcommand{\dist}{\displaystyle}
\usepackage{enumitem}
\makeatletter
\DeclareRobustCommand{\pder}[1]{%
\@ifnextchar\bgroup{\@pder{#1}}{\@pder{}{#1}}}
\newcommand{\@pder}[2]{\frac{\partial#1}{\partial#2}}
\makeatother
\newcommand{\pdev}[2]{\frac{\partial #1}{\partial #2}}
\newcommand{\pdevII}[2]{\frac{\partial^2 #1}{\partial {#2}^2}}
\newcommand*{\pd}[3][]{\ensuremath{\frac{\partial^{#1} #2}{\partial #3}}}
\geometry{
a4paper,
total={210mm,297mm},
left=15mm,
right=15mm,
top=15mm,
bottom=16mm,
}
\begin{document}
\begin{equation*}
z^{2}\pd[2]{}{t}+z\pd{\left(\pd[2]{}{y}+\pd[2]{}{x}\right)}{t}
\end{equation*}
\end{document*}
Secondly is there a way of reducing the space between text and the following equation? The space I get is too large.
Best Answer
Like this image:
Just move the
\pd{}{t}
directly to the right ofz
. Also, as suggested by @egreg, there is no need for themdwlist
package. It's functionality is better achieved using the powerfulenumitem
package.