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2. Direct methods
The first conceivable method for solving the above linear system is Gauss's method of elimination (or its variants, such as Crout's method or Cholesky's method, etc.).), whose complexity, i.e. the number of arithmetic operations, is of the order of
; if A is a symmetrical matrix, the number of arithmetic operations reduces to
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Direct methods
Iterative point and block relaxation methods
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