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Table 1 Choices of matrix Q for Example 4.1

From: Some generalizations of the new SOR-like method for solving symmetric saddle-point problems

  Matrix Q Description
Case I \(B^{T}\hat{A}^{-1}B\) Â = diag(A)
Case II \(B^{T}\hat{A}^{-1}B\) Â = tridiag(A)