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freeze, thaw - replace an expression by a name
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Calling Sequence
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freeze(expr)
thaw(var)
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Parameters
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expr
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the expression to be ``frozen''
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var
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the ``frozen'' variable
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Description
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freeze replaces its argument, expr (not a name and not a rational number), with a name of the form freeze/R0, freeze/R1, ...
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To return the original expression the thaw function must be used.
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This can be used to prevent parts of an expression from being subjected to the effects of symbolic manipulation.
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Examples
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