The matrix "Ti" of formula_42 is the ("m" + "n" − "i") × ("m" + "n" − 2"i")-submatrix of "S" which is obtained by removing the last "i" rows of zeros in the submatrix of the columns 1 to "n" − "i" and "n" + 1 to "m" + "n" − "i" of "S" (that is removing "i" columns in each block and the "i" last rows of zeros). The "principal subresultant coefficient" "si" is the determinant of the "m" + "n" − 2"i" first rows of "Ti".