[OS X TeX] Effect of `leqno' on \begin{gather} and \begin{align}
Don Green Dragon
fergdc at Shaw.ca
Mon Apr 18 19:42:35 EDT 2011
Hi All,
I typeset with LaTeX and am using TeXShop 2.38 running under Mac OS X 10.6.7.
My normal document class line is:
\documentclass [11pt, fleqn, leqno] {book}
and it is followed by
\usepackage{amsmath}
plus a horde of other packages and used-defined stuff. But the above two lines appear to be the crux of what I am concerned with.
When I use math environments which number equations, then the typesetting of \begin{gather} and \begin{align} is not what I expect and does not correspond to what I find in George Graetzer's book, and Graetzer does give examples where equations are numbered at the left margin.
The problem is this:
If the source code is:
\documentclass [11pt, fleqn, leqno] {book}
\usepackage{amsmath}
\begin{document}
\mainmatter
The equations are:
\begin{gather}
a = b+c\\
x = y+z
\end{gather}
\end{document}
then it typesets as (essentially):
==========
The equations are:
(1) a=b+c
(2) x=y+z
==========
which is fine, but .... NOTE that the above comes before any \chapter command. However, now I include a \chapter command, as in
\begin{document}
\mainmatter
\chapter[Short Title]{\centering {The Loooong Title for Chapter 1}}
The equations are:
\begin{gather}
a = b+c\\
x = y+z
\end{gather}
\end{document}
and the above typesets as (ignoring the two chapter heading lines):
==========
The equations are:
(1.1)
a=b+c
(1.2)
x=y+z
==========
I was expecting:
==========
The equations are:
(1.1) a=b+c
(1.2) x=y+z
==========
The same sort of phenomenon occurs with \begin{align} and \begin{alignat} and I get the same response on replacing {book} with {memoir}.
I tried other versions of the \documentclass line, such as
\documentclass [11pt, fleqn] {book}
which is okay within a \chapter command except for the fact that the equation numbering is at the right margin which I would like to avoid. Similarly,
\documentclass [11pt, leqno] {book}
is okay except for the equations being centered.
If I have to live with the format
==========
The equations are:
(1.1)
a=b+c
(1.2)
x=y+z
==========
then that's life with TeX I guess, but I'm wondering if I've missed something!
Don Green Dragon
fergdc at Shaw.ca
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