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2.1 matrices class design 2.2 matrix foundations to operate 2.3 solid matrix inversions to elect principal element Gauss- when approximately the law 2.4 duplicate matrix inversions all elect principal element Gauss- when approximately the law 2.5 symmetrical Zhengding matrices ask the counter 2.6 request Belize matrix inversion to hold method 2.7 to ask the determinant value especially blue to choose the principal element gaussian elimination 2.8 to ask the matrix order to elect principal element gaussian elimination 2.9 symmetrical Zhengding matrices Jory Siji to decompose and the determinant evaluation 2.10 matrix triangles decompose 2.11 general solid matrices QR to decompose 2.12 general solid matrices the singular values to decompose 2.13 to ask the generalized counter singular value resolution 2.14 reduction symmetrical matrices for the symmetrical three opposite angle House Holland GermanyA method of transformation 2.15 solid symmetrical three opposite angle complete characteris