O The matrix is in RRE form O There is a leading entry of a row that is NOT one 1 0 3 0 0 0 0 1 4 O Leading ones DO NOT appear further to the right from row to row O O There is a row of zeros that is NOT at the bottom of the matrix Matrix 4 4 0 1 NOT all other entries in a column with a leading one are zero The matrix is in RRE form 1 3 0 4 004 4 000 0 There is a leading entry of a row that is NOT one