HoldPattern
 Usage
Notes
 Further Examples
Arithmetic operations work on patterns in the same way as on any other symbolic entity.
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Patterns are not considered to be special outside the context of the pattern matcher.
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Use HoldPattern when you want to control the evaluation of patterns.
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The defined function ff replaces sums of subexpressions of the form b[i] x[i] by z.
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In the numerator b[1] x[1] + b[2] x[2] is replaced by z but b[3] x[4] is left alone since the arguments of b and x are not the same.
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