magma:// Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("883.1");
S:= CuspForms(chi, 2);
N := Newforms(S);
sage:from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(883, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0]))
N = Newforms(chi, 2, names="a")
This newform subspace can be constructed as the kernel of the linear operator
\( T_{2}^{39} - 10 T_{2}^{38} - 9 T_{2}^{37} + 401 T_{2}^{36} - 716 T_{2}^{35} - 6830 T_{2}^{34} + \cdots + 6696 \)
acting on \(S_{2}^{\mathrm{new}}(\Gamma_0(883))\).