6 Commands and Declarations
A command is an order to the system to do something. Some commands cause visible
results (such as calling for input or output); others, usually called declarations, set
options, define properties of variables, or define procedures. Commands are formally
defined as a statement followed by a terminator
\(\langle \)command\(\rangle \) | \(\longrightarrow \) | \(\langle \)statement\(\rangle \)\(\langle \)terminator\(\rangle \) |
\(\langle \)terminator\(\rangle \) | \(\longrightarrow \) | ;\(\ \mid \ \)$ |
Some REDUCE commands and declarations are described in the following
sub-sections.
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