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Application of the rule
The part of the expression selected for the manipulation come under the system’s control. When a
part of the symbolic representation is selected for manipulation, only those commands that can be
applied to that part are available.
The figure below illustrates the manipulation of an expression. It can be noted that, in accordance with the
current selection, only some commands are make available.
Clicking with the right mouse button on an expression, different functions are available for that
expression:
These functions will be described in the following.
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