This is version 2.5, last revised 2010/02/10; documentation date 2005/04/09.

**
Author: F. Bosisio
E-mail:
fbosisio@bigfoot.com
CTAN location:
macros/latex/contrib/bosisio
**

Documentation for the package `envmath`.

This package provides some useful math-commands and enviroments, which are simpler to use and prettier then their standard LaTeX counterpart.

In particular some commands are redefined (see next section if you don't want them to be redefined), so care should be taken, expecially when including this package in an already existent LaTeX file.

The redefined commands are:

`\(`, `\)`,
`\[`, `\]`,
`\{` and `\}`.

The effect of ```\(` ...`\)`'' can still be achieved by
the LaTeX equivalent commands ```\begin{math} ... \end{math}`''
or ```$...$`''.

Similarly, the effect of ```\[...\]`'' can be achieved by the
LaTeX equivalent commands
```\begin{displaymath}...\end{displaymath}`'' or
```$$...$$`''.

The ```\{`'' and ```\}`'' commands are the more
error-prone, since one may try to use ```\left\{`'', which now
is incorrect, because the ```\{`'' command already contains a
```\left`'' declaration.
In the rare occasions where a brace of normal size is needed, one can use
the LaTeX commands ```\lbrace`'' and ```\rbrace`''.

Also the ```equation`'' environment has been
changed, but it is completly compatible with the original definition, so it
should be safe, perhaps except when the first character of the equation is
an open square bracket or it is placed in a moving argument:
in fact, the new version of this command is fragile, and this is true also
for most of the commands defined by this package.

At now, five options are available with the `envmath` package.

The ```RedefEquation`''/```StdEquation`'' and
```RedefBrackets`''/```StdBrackets`'' options control
whether the ```equation`'' environment and the brace commands
```\(`'', ```\)`'', ```\[`'',
```\]`'', ```\{`'' and ```\}`'' should
be redefined or retain their original LaTeX meaning.

More precisely, ```RedefEquation`'' (default) redefines the
``equation'' environment to have an optional argument (used as a label),
while ```StdEquation`'' leaves it unchanged.
In the first case, the ``equation'' environment will be equivalent to the
``Equation'' environment (capitalized!) described
below, whereas in the second case they will be different.

Similarly, the ```RedefBrackets`'' option (default) makes the
bracket commands to be redefined, whilst
```StdBrackets`'' leave them their original meaning.

Also a ```Standard`'' option exists, which amounts to specify both
the ```StdEquation`'' and ```StdBrackets`'' options, thus making
the package fully standard, which may be useful when sending your
LaTeX files to someone else.

This package provides some math-mode environments, each with a ``*-form'' which does not generates numbers (or produce sub-numbering).

The ```Equation`'' environment has an optional argument which is used
as a label to reference it.

\begin{Equation}[<label>] ... \end{Equation}

If the ```RedefEquation`'' option is in effect (default), then
the ```equation`'' environment is redefined to have the same optional
argument as ```Equation`''.

There is also a *-form, which does not generate a number (so this *-form is really a ``displaymath'' and not an equation, but it has been added for simmetry and for making it easier to add or remove the number to a formula).

The *-form has an optional argument like the non-* form, which is disregarded by the environment and is added only for simmetry reasons.

\begin{equation*}[<disregarded-label>] ... \end{equation*}

The ```MultiLine`'' environment is intended for formulas that don't
fit on a single line, and so must be broken across lines.

As for the `Equation` environment above,
it has an optional argument which is used as a label.

All the lines but the first are automatically indented by the lenght
```\MultiLineIndent`'', which is rougthly what one expects, but
can be changed at any time by the user with
```\setlenght\MultiLineIndent{...}`''.
You can also control the alignment of the continuation rows by placing an
optional `&` in the first row: is such a case all the others line
will *not* be indented by ```\MultiLineIndent`'' but wil behave
*as if* there were an ampersand in front of them (i.e. they will be
left-aligned at the right of the & in the first row).

Each line but the last must end with a ```\\`'' command
(which can have an optional argument to add some vertical space between
lines).
When the line is broken in the middle (e.g. after a ``+'' sign) and not at
the end (i.e. after a ``='' or similar), the *-form ```\\*`''
may be used to indicate the line-break, the difference being in an extra
space added at the beginning of the next line.
The width of a this space defaults to 1em and can be changed by the user
with ```\setlenght\MultiLineStarIndent{...}`''.

\begin{MultiLine}[<label>] ... [&]= ... = \\ = ... + \\* + ... = \\ = ... \end{MultiLine}

Also this environment has a *-form which differs only in that it does not generate an equation number.

\begin{MultiLine*}[<disregarded-label>] ... [&]= ... = \\ = ... + \\* + ... = \\ = ... \end{MultiLine*}

The ```System`'' environment is used for grouping a set of equations
together inside a left brace, with one only equation number.

Again there is an optional argument to indicate a label and each equation
is separated by a ```\\`'' or ```\\*`'' command,
as for the ```MultiLine`'' environment.

The rows (except the ones ended with the *-form ```\\*`'')
may optionally contain one ```&`'', which is usually used when
some text should be added to the equation.

\begin{System}[<label>] ... = ... [& ...] \\ ... = ... + \\* + ... [& ...] \\ ... = ... [& ...] \end{System}

A *-form which does not generate any number is also provided.

\begin{System*}[<disregarded-label>] ... = ... [& ...] \\ ... = ... + \\* + ... [& ...] \\ ... = ... [& ...] \end{System*}

The ```EqSystem`'' environment is used for grouping a set of equations
together inside a left brace, each with its own equation number.

Again there is an optional argument to indicate a label and each equation is
separated by a ```\\`'' or ```\\*`'' command.

The rows may optionally contain one ```&`'', which is usually used
when some text should be added to the equation.

\begin{EqSystem}[<label>] ... = ... [& ...] \\ % (1.1) ... = ... + \\* % + ... [& ...] \\ % (1.2) ... = ... [& ...] % (1.3) \end{EqSystem}

A *-form is also provided: it differs in that each equation is numbered with the same number but with a lowercase letter added, i.e. like (1.1a), (1.1b), etc. instead of (1.1), (1.2) and so on.

\begin{EqSystem*}[<label>] ... = ... [& ...] \\ % (1.5a) ... = ... + \\* % + ... [& ...] \\ % (1.5b) ... = ... [& ...] % (1.5c) \end{EqSystem*}In both cases, if the optional argument is present, each equation can be referenced by

In addition to the previously mentioned environments, the `envmath`
package defines also some of math-mode commands which considerably simplify
the use of adjustable-size parentheses.

The ```\(`'', ```\[`'', ```\{`'',
```\)`'', ```\]`'' and ```\}`'' generates
the corresponding parenthesis but with a ```\left`'' or
```\right`'' declaration (respectively) added, so they must come
in matched pairs or coupled with a ```\left.`'' or
```\rigtht.`'' or another adjustable-size delimiter.

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