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Let the linear system Ax=b where the coefficient matrix A=(a<sub>ij</sub>)∈R<sup>m,n</sup> is an L-ma-trix(that is,a<sub>ij</sub>】0 （?） i and a<sub>ij</sub>≤0 （?） i≠j),A=I-L-U,I is the identity matrix,-L and