Complete "not so minimal" example :
Code: Select all
\documentclass[12pt,letterpaper]{article}
\usepackage[T1]{fontenc}
\usepackage{setspace}
\setstretch{1.1}
\usepackage{anysize}
\marginsize{1.5in}{1in}{0.5in}{0.5in}
\usepackage{amsmath}
\usepackage{tensor}
\everydisplay{\predisplaysize=\dimexpr\predisplaysize-2em\relax}
\newcommand*{\1}{\hspace{1pt}}
\begin{document}
\section{Code with spacement problems}
Bla bla bla bla bla bla bla blabla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla :
\begin{equation}
A + B - C = 0.
\end{equation}
Bla bla blabla bla bla blabla bla bla bla
\begin{equation}
D + E = F.
\end{equation}
bla bla bla bla :
\begin{equation}
P - G + H = K - L,
\end{equation}
bla bla bla blabla bla bla blabla bla bla blabla bla bla blabla bla bla blabla bla bla blabla bla bla blabla bla bla bla.
\begin{equation}
A + B - C + G - H = J - K.
\end{equation}
bla bla bla blabla bla bla
\begin{equation}
A + B - C + G - H = J - K.
\end{equation}
bla bla blabla bla blabla bla blabla bla blabla bla blabla bla blabla bla blabla bla blabla bla blabla bla blabla bla blabla bla blabla bla blabla bla blabla bla blabla bla blabla bla blabla bla blabla
\begin{equation}
C + D - H = FG - HK
\end{equation}
On a donc
\begin{align*}
-\, \tensor{g}{^{ij}} \, \tensor{h}{_{jk}} \; \tensor{g}{_{00}} &= -\, \tensor{g}{^{ij}} \1 (\, \tensor{g}{_{0 \1 j}} \, \tensor{g}{_{0 \1 k}} - \tensor{g}{_{00}} \, \tensor{g}{_{jk}} ) \\ \\
&= -\, \tensor{g}{^{ij}} \, \tensor{g}{_{j \1 0}} \, \tensor{g}{_{k \1 0}} + \tensor{g}{_{00}} \, \tensor{g}{^{ij}} \, \tensor{g}{_{jk}} \\ \\
&= \tensor{g}{^{i \1 0}} \, \tensor{g}{_{00}} \, \tensor{g}{_{k \1 0}} + \tensor{g}{_{00}} \, \tensor{\delta}{^i_k} - \tensor{g}{_{00}} \, \tensor{g}{^{i \1 0}} \, \tensor{g}{_{0 \1 k}} \\ \\
&= \tensor{g}{_{00}} \, \tensor{\delta}{^i_k},
\end{align*}
ce qui implique
\end{document}
