19.17 IsLaurentPolynomialRing

IsLaurentPolynomialRing( domain )

IsLaurentPolynomialRing returns true if the object domain is a ring record, representing a Laurent polynomial ring (see LaurentPolynomialRing), and false otherwise.

    gap> IsPolynomialRing( Integers );                  
    false
    gap> IsLaurentPolynomialRing( PolynomialRing( Integers ) );
    false
    gap> IsLaurentPolynomialRing( LaurentPolynomialRing( Integers ) );
    true 

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