A nonzero row or columnA leading entry of row: the leftmost nonzero entry※ entry: values in matrixEchelon FormsAll nonzero rows are above any row of all zeros.Each leading entry of a row is in a column to the right of the leading entry of the row above itReduced echelon formsThe leading entry in each nonzero row is 1.Each leading 1 is the only non zero entry in its column.Theorem 1. Uniqueness o..
