Notebook[List[Cell[BoxData[FormBox[GridBox[List[List[RowBox[List[RowBox[List[SubsuperscriptBox[StyleBox["D", Rule[FontSlant, "Plain"]], "c", "r"], "=", RowBox[List[UnderscriptBox["\[Sum]", RowBox[List["1", "\[LessEqual]", "k", "\[LessEqual]", "3"]]], SubsuperscriptBox[StyleBox["D", Rule[FontSlant, "Plain"]], RowBox[List["c", ",", "k"]], "r"]]]]], ",", RowBox[List[SubsuperscriptBox[StyleBox["D", Rule[FontSlant, "Plain"]], "c", "p"], "=", RowBox[List[UnderscriptBox["\[Sum]", RowBox[List["1", "\[LessEqual]", "k", "\[LessEqual]", "3"]]], SubsuperscriptBox[StyleBox["D", Rule[FontSlant, "Plain"]], RowBox[List["c", ",", "k"]], "p"]]]]], ",", RowBox[List[SubsuperscriptBox[StyleBox["D", Rule[FontSlant, "Plain"]], "c", "f"], "=", RowBox[List[UnderscriptBox["\[Sum]", RowBox[List["1", "\[LessEqual]", "k", "\[LessEqual]", "3"]]], RowBox[List[SubsuperscriptBox[StyleBox["D", Rule[FontSlant, "Plain"]], RowBox[List["c", ",", "k"]], "f"], "."]]]]]]]], TagBox[StyleBox[TagBox[RowBox[List["(", RowBox[List["Eq", ".", " ", "8"]], ")"]], Null, Rule[Editable, True], Rule[Selectable, True]], "EquationLabel", Rule[Deletable, False], Rule[ZeroWidthTimes, True]], Null, Rule[Editable, False]]]], Rule[RowSpacings, 2.], Rule[ColumnWidths, List[Fit, Automatic]], Rule[RowAlignments, Top], Rule[ColumnAlignments, List[TextAlignment, Right]]], TraditionalForm]], "Input"]]]