Gauss Elimination Algorithm For Interval Matrix

Let [a] = [[aij]]nxnbe an interval for [a^-] = [a^-, a^-] (i,j = l,2,...,n). in transformation a matrix into upper triangular matrix by gauss method, entries under the main diameter should be zero by elementary row operations. in this paper we consider zero as an interval; and, we would apply gauss elimination method on interval matrix by arithmetic operations on intervals and the definition of comparison method interval dates, we would use gauss elimination method on interval matrix.