pkgs: {
  paths = with pkgs;
    let
      python3 = python39.withPackages ( ps: with ps; [
        matplotlib
        numpy
        scipy
        sympy
      ]);
      jupyterPath = jupyter-kernel.create { definitions = {
	octave = octave-kernel.definition;
      };};
    in
  [
    (jupyter.override {
      definitions = {
        octave = octave-kernel.definition;
      };
      inherit python3; 
    })
  ];
}