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\documentclass[12pt]{article}
\usepackage{graphicx}
\usepackage{amsmath}
\usepackage{amsthm}
\usepackage{mdwlist}
\usepackage{natbib}
\usepackage{showkeys} %To see labels (of equations, proof and lemma numbers) when working on a draft.
\usepackage{paralist}% Package that allows different types of lists such as in paragraph lists.
\usepackage{pdfsync}
\usepackage{setspace}
\usepackage[margin=1in,left=1.2in]{geometry}
\usepackage[T1]{fontenc}
\usepackage[charter]{mathdesign}
\usepackage{lipsum}
\def\sm{\scriptscriptstyle}
\usepackage{tikz}
\newtheorem{proposition}{Proposition}
\setlength{\parindent}{0in}
\setlength{\parskip}{2ex plus 0.5ex minus 0.2ex}
\doublespacing
\begin{document}
\lipsum[1]
\begin{proposition}\label{propPB}
Look at the space below this line. It is too much. How can I reduce it?
\begin{enumerate}[(a)]
\item I want to be closer to the line above. Please help me.
\item I am pushing the item above, but it just does not move.
\begin{equation}
\frac{\delta_{0}}{\delta_{1}} >(<) \frac{F_{\sm D}(EG_{\sm D}^{\sm 0B}) f_{D}(EG_{\sm D}^{\sm 1B})}{F_{D}(EG_{\sm D}^{\sm 1B}) f_{D}(EG_{\sm D}^{\sm 0B})}
\end{equation}
\end{enumerate}
\end{proposition}
\lipsum[2]
\the\plitemsep
\end{document}