
// Make newform 504.2.bm.c in Magma, downloaded from the LMFDB on 14 June 2024.
// To make the character of type GrpDrchElt, type "MakeCharacter_504_bm();"
// To make the Hecke irreducible modular symbols subspace (type ModSym)
// containing the newform, type "MakeNewformModSym_504_2_bm_c();".
// This may take a long time!  To see verbose output, uncomment the SetVerbose line below.
// The default sign is -1.  You can change this with the optional parameter "sign".
// To make the character of type GrpDrchElt, type "MakeCharacter_504_bm();"
function MakeCharacter_504_bm()
    N := 504;
    order := 6;
    char_gens := [127, 253, 281, 73];
    v := [3, 3, 3, 2];
    // chi(gens[i]) = zeta^v[i]
    assert UnitGenerators(DirichletGroup(N)) eq char_gens;
    F := CyclotomicField(order);
    chi := DirichletCharacterFromValuesOnUnitGenerators(DirichletGroup(N,F),[F|F.1^e:e in v]);
    return MinimalBaseRingCharacter(chi);
end function;

function MakeCharacter_504_bm_Hecke(Kf)
    return MakeCharacter_504_bm();
end function;


// To make the Hecke irreducible modular symbols subspace (type ModSym)
// containing the newform, type "MakeNewformModSym_504_2_bm_c();".
// This may take a long time!  To see verbose output, uncomment the SetVerbose line below.
// The default sign is -1.  You can change this with the optional parameter "sign".
function MakeNewformModSym_504_2_bm_c( : sign := -1)
    R<x> := PolynomialRing(Rationals());
    chi := MakeCharacter_504_bm();
    // SetVerbose("ModularSymbols", true);
    Snew := NewSubspace(CuspidalSubspace(ModularSymbols(chi,2,sign)));
    Vf := Kernel([<5,R![20736, 0, 124416, 0, 505728, 0, 1115136, 0, 1764400, 0, 1403872, 0, 786520, 0, 240312, 0, 52217, 0, 6622, 0, 603, 0, 30, 0, 1]>],Snew);
    return Vf;
end function;