
// Make newform 2100.2.ce.d in Magma, downloaded from the LMFDB on 25 April 2024.
// To make the character of type GrpDrchElt, type "MakeCharacter_2100_ce();"
// To make the Hecke irreducible modular symbols subspace (type ModSym)
// containing the newform, type "MakeNewformModSym_2100_2_ce_d();".
// 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_2100_ce();"
function MakeCharacter_2100_ce()
    N := 2100;
    order := 12;
    char_gens := [1051, 701, 1177, 1501];
    v := [12, 12, 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_2100_ce_Hecke(Kf)
    return MakeCharacter_2100_ce();
end function;


// To make the Hecke irreducible modular symbols subspace (type ModSym)
// containing the newform, type "MakeNewformModSym_2100_2_ce_d();".
// 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_2100_2_ce_d( : sign := -1)
    R<x> := PolynomialRing(Rationals());
    chi := MakeCharacter_2100_ce();
    // SetVerbose("ModularSymbols", true);
    Snew := NewSubspace(CuspidalSubspace(ModularSymbols(chi,2,sign)));
    Vf := Kernel([<11,R![900, 600, 460, 20, 24, 2, 1]>,<17,R![656100000000, 0, 0, 0, -34227360000, 0, 0, 0, 1468049536, 0, 0, 0, -14944352, 0, 0, 0, 111408, 0, 0, 0, -392, 0, 0, 0, 1]>],Snew);
    return Vf;
end function;