13.7 NofCyc

NofCyc( z )
NofCyc( list )

returns the smallest positive integer n for which the cyclotomic z is resp. for which all cyclotomics in the list list are contained in Q_n = Q( e^{frac{2 pi i}{n}} ) = Q( 'E(<n>)' ).

    gap> NofCyc( 0 ); NofCyc( E(10) ); NofCyc( E(12) );
    1
    5
    12

NofCyc is an internal function.

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