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type/symmfunc - check for a symmetric function
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Calling Sequence
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type(f, symmfunc(x, y, ...))
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Parameters
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f
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function
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x, y, ...
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name(s)
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Description
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This procedure tests the symmetry of the function f with respect to the argument(s)  .
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It returns true if f is symmetric in all of the given variables, and false otherwise.
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Examples
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>
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Note that any function of a single variable is symmetric in that variable:
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