check for an SDMPolynom data structure
The type(a, SDMPolynom) calling sequence checks that a is an SDMPolynom.
The parameter a is a polynomial in all of its indeterminates.
Note: The command SDMPolynom has been deprecated. A sparse distributed data structure is used by default for polynomials and is often more efficient than SDMPolynom. For information on creating and working with polynomials, see polynom.
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