In this chapter we come to grips with the question of how to solve, in practice, systems of linear equations. Our strategy will be to gather a certain number of observations which will allow us to form a strategy. Given that many mathematicians often use the adjective clear for something which usually is far from clear but is tiresome to prove we will prove our good intention to avoid this bad habit by beginning with an observation that is totally clear.
KeywordsLinear Equation Identity Matrix Triangular Matrix Main Diagonal Gaussian Elimination
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