Linear Algebra, Spreadsheets.
transformed row j. Therefore, if we change the signs of the off diagonal elements of M1, M2 and M3, we get inv(M1), inv(M2), and inv(M3). The L calculations are set in the spreadsheet as L3=inv(M3), L2=inv(M2)⋅L3 and L1=inv(M1)⋅L2. But just as in the U calculation steps, an Lk=inv(Mk)⋅Lk1 matrix