13.13 StarCyc

StarCyc( z )

If z is an irrational element of a quadratic number field (i.e. if z is a quadratic irrationality), StarCyc( z ) returns the unique Galois conjugate of z that is different from z; this is often called <z>ast (see DisplayCharTable). Otherwise false is returned.

    gap> StarCyc( EB(5) ); StarCyc( E(5) );
    E(5)^2+E(5)^3
    false

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