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Unclear proof in the Gauss-Markov theorem


Proof that Gauss-Jordan elimination worksPerron-Frobenius theoremWhat is the matrix norm in defining the generator of a continuous time Markov chain?Square root of a positive-definite Markov matrixThe characteristic polynomial of A matrix A^k related to AHow to convert Gauss-Siedel method to Successive Over Relaxation method.What's wrong with my “proof” of the Cayley-Hamilton Theorem?Theorems of solution of a linear system in linear algebra.How to understand the improvement of Levenberg-Marquardt algorithm to Gauss-Newton method?Markov Chain Probability question













0












$begingroup$


I don't understand a step in the proof of the Gauss-Markov theorem:
proof



Mainly, why can we simply replace y with e, given that y is defined as:
y definition



Thanks in advance!










share|cite|improve this question









$endgroup$
















    0












    $begingroup$


    I don't understand a step in the proof of the Gauss-Markov theorem:
    proof



    Mainly, why can we simply replace y with e, given that y is defined as:
    y definition



    Thanks in advance!










    share|cite|improve this question









    $endgroup$














      0












      0








      0





      $begingroup$


      I don't understand a step in the proof of the Gauss-Markov theorem:
      proof



      Mainly, why can we simply replace y with e, given that y is defined as:
      y definition



      Thanks in advance!










      share|cite|improve this question









      $endgroup$




      I don't understand a step in the proof of the Gauss-Markov theorem:
      proof



      Mainly, why can we simply replace y with e, given that y is defined as:
      y definition



      Thanks in advance!







      matrices least-squares






      share|cite|improve this question













      share|cite|improve this question











      share|cite|improve this question




      share|cite|improve this question










      asked yesterday









      ToTomToTom

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      526




















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