50.7 Indicator

Indicator( tbl, n )
Indicator( tbl, chars, n )
Indicator( modtbl, 2 )

For a character table tbl, Indicator( tbl, chars, n ) returns the list of n-th Frobenius Schur indicators for the list chars of characters.

Indicator( tbl, n ) does the same for chars = tbl.irreducibles, and additionally the result is stored in the field irredinfo of tbl.

Indicator( modtbl, 2 ) returns the list of 2nd indicators for the irreducible characters of the Brauer character table modtbl and stores the indicators in the irredinfo component of modtbl; this does not work for tables in characteristic 2.

    gap> t:= CharTable( "M11" );; Indicator( t, t.irreducibles, 2 );
    [ 1, 1, 0, 0, 1, 0, 0, 1, 1, 1 ]

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