Set (=)
 Usage
Notes
 Further Examples
When you make an assignment with the Set (or =) operator, the right-hand side is evaluated immediately.
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on the other hand, with SetDelayed the evaluation is postponed until zzz is evaluated, so no output is generated.
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The difference between yyy and zzz is not apparent until x is set to a symbolic expression.
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This defines the function ff.
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