Аналитическая геометрия и линейная алгебра. Умнов А.Е. - 199 стр.

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                                                              1 2 3             ξ1   η1
                                                              2 3 4             ξ2 = η2 
                                                              3 5 7             ξ3   η3
                                               
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                               3 5 7 η3       0 0 0 − η1 − η 2 + η3      3 5 7
                                                                                     
         
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