12.6 Set Functions for Rationals

As was already mentioned in the introduction of this chapter the GAP object Rationals is the domain of all rationals. All set theoretic functions, e.g., Intersection and Size, are applicable to this domain.

    gap> Intersection( Rationals, [ E(4)^0, E(4)^1, E(4)^2, E(4)^3 ] );
    [ -1, 1 ]    # 'E(4)' is the complex square root of -1
    gap> Size( Rationals );
    "infinity" 

This does not seem to be very useful.

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