Notebook[List[Cell[BoxData[FormBox[GridBox[List[List[RowBox[List[SubsuperscriptBox[StyleBox["c", Rule[FontSlant, "Plain"]], RowBox[List["i", ",", "k"]], "\[DoublePrime]"], "=", FractionBox[RowBox[List[UnderscriptBox["\[Sum]", RowBox[List["j", "\[Element]", "N"]]], RowBox[List[SubscriptBox[StyleBox["w", Rule[FontSlant, "Plain"]], "ij"], SubsuperscriptBox[StyleBox["c", Rule[FontSlant, "Plain"]], RowBox[List["j", ",", "k"]], "\[Prime]"]]]]], RowBox[List[UnderscriptBox["\[Sum]", RowBox[List["j", "\[Element]", "N"]]], SubscriptBox[StyleBox["w", Rule[FontSlant, "Plain"]], "ij"]]]]]], TagBox[StyleBox[TagBox[RowBox[List["(", RowBox[List["Eq", ".", " ", "18"]], ")"]], 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"]]]