Аналитическая геометрия и линейная алгебра. Умнов А.Е. - 293 стр.

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E¯ÈmËÓ ρ 2 = ( f − ∑ξ k g k , f − ∑ ξ k g k ) º­Ë¯ËäÏÓÈËÓÒ«}ºªÁÁÒÒËӈºm ξ k , k = [0, n] 
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           ρ 2 = ( f − ∑ ξ k g k , f − ∑ξ k g k ) = ( f , f ) − 2 ∑ ξ k ( f , g k ) + ∑∑ ξ k ξ i ( g k , g i ) 
                           k =0                k =0                            k =0                    k = 0i = 0
           
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                            ρ 2 = ( f , f ) − ∑ξ k∗ ( f , g k ) + ∑ξ k∗ (−( f , g k ) + ∑ξ i∗ ( g k , g i )) =
                                                k =0                   k =0                       i =0
                                                                                                                            
                                                  n                                   n
                                   = ( f , f ) − ∑ξ k∗ ( f , g k ) = ( f , f − ∑ξ k∗ g k ).
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