Аналитическая геометрия и линейная алгебра. Умнов А.Е. - 225 стр.

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                      ¹Ë¯ËäËÓÓ©² m °ã‚ÈË }ºÈ ²ºˆ« ­© ºÓº ÒÏ Ò°Ëã ϕ ii , i = [2, n]  ÓË ¯ÈmÓº
                      ӂã p°ãÒÎËm°Ë ϕ ii , i = [1, n] ¯ÈmÓ©ӂã ºÓºm¯ËäËÓÓºˆº­ËϺ¯ÈÓÒ
                      ËÓÒ« º­Óº°ˆÒ äºÎÓº °҈Ȉ  ˆº ϕ 12 ≠ 0  ‘ºÈ m©¹ºãÓ««
                      ÓËm©¯ºÎËÓӂ ÏÈäËӂ¹Ë¯ËäËÓÓ©² ξ 1 = ξ 1′ + ξ 2′ ,ξ 2 = ξ 1′ − ξ 2′ ,ξ 3 = ξ 3′ ,...,ξ n = ξ n′ 
                      ¹ºã‚ÈËä ÏȹҰ  }mȯȈÒÓºº Á‚Ó}ÒºÓÈãÈ ° ÓËӂãËm©ä ÒȺÓÈã Ó©ä
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                      Ë F (ξ1′ , ξ 2′ , ξ 3′ ,..., ξ n′ ) ÓË°º˯Î҈}mȯȈºmºˆ ξ 1′ Ò ξ 2′ 
  
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                                               = α12 + 2 ∑α1α k + ( ∑α k ) 2 =α12 + 2 ∑α1α k +                              ∑∑α kα i .
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                      Òº}ºÓȈËã Óº  (x )                      ϕ11(ξ1 + ∑            ξ i ) + ∑ ∑ (ϕ ik − 1k 1i )ξ iξ k . 
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