Definitions of mathematical terms and declaration of symbols
When writing articles containing math, I would like to have a way to
ensure that I am not using an undefined term or symbol. For instance, I
want to use the term "simple algebra" only after I define it. For this, I
can create a command
\newcommand{\simplealgebra}{simple algebra}
and place it just before the \begin{definition} command in which I define
it. On the other hand, if I write another paper, where I use the same term
or symbol, I don't want to end up by having duplicate commands, so I want
to keep all the commands defined in one place, in the preamble, which
possibly I want to share between more documents.
Is there any way to combine the two conditions, namely, to have the
command defined in the preamble, but to ensure the usage of the command
only from one point in the document body?
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