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From: texinfo1@rusmv1.rus.uni-stuttgart.de (Rainer Schoepf)
Newsgroups: comp.text.tex
Subject: Re: \newenvironment and equations
Summary: It's a feature, not a bug!
Message-ID: <1991May10.200437.8054@rusmv1.rus.uni-stuttgart.de>
Date: 10 May 91 20:04:37 GMT
References: <1991May10.065801.20125@fwi.uva.nl>
Organization: Comp.Center (RUS), U of Stuttgart, FRG
Lines: 42

In article <1991May10.065801.20125@fwi.uva.nl> smagt@fwi.uva.nl (Patrick van der Smagt) writes:
>Please help me!  I can't figure it out.  When I define
>--------------
>\newenvironment{teq}{\begin{equation}}{\end{equation}}
>\begin{teq}
>x^2 + y^2 = c^2,
>\end{teq}
>To get the correct generalisation of the rule as
>presented in the previous chapter, we must set
>--------------
>
>the line following this displayed equation is indented by a
>space.  In this specific case, the output of dvitty is
>
>--------------
>                      x2 +y2= c2;                    (1)
>
> To get the correct generalisation of the rule as presented in the
>previous chapter, we must set
>--------------
>
>This looks like a bug in \newenvironment, or is this a
>feature of one of those wonderful LaTeX commands?
>
>						Patrick van der Smagt


You have a space (actually an end-of-line) after your

\end{teq}

and consequently, you get a space in the output. 

This behaviour is the same for every LaTeX environment, except for a few
special ones (like equation) that explicitly discard spaces following their
\end tag.

[Classified information: this is done by setting a global switch to true,
 with the name of `@ignore'. The \end command checks that switch and
 calls TeX's \ignorespaces primitive, if necessary.]

Rainer Sch\"opf