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Question:

Ax=b

Let the coefficient matrix A be written in the form, where D is the diagonal matrix whose diagonal is the same as that of A, -L is the strictly lower triangular part of A and -U is the strictly upper part of A. Furthermore, letA=D-L-Ube the iteration matrix for Jacobi's method. Prove that Jacobi's method is convergent if the coefficient matrix is diagonally dominant.T_{j}= D^{-1}(L+U)

If A and

__b__are given, I know how to use the Jacobi's method to find out whether or not A is convergent. But how should I prove that "

**Jacobi's method is convergent if A is diagonally dominant**" using just those given letters and symbols?