Аналитическая геометрия и линейная алгебра. Умнов А.Е. - 36 стр.

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     →                                                                              ξ1 = ξ1′ cos ϕ − ξ 2′ sin ϕ + β1
  e2  e2 ′  e1 ′                                                                  
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     O e1 ϕ e2 ′                 nº¯ä‚㩹˯˲ºÈ­‚‚ˆÒäˈ mÒ
                                                               
 
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ºÒÓÈ}ºmÈ« ˆºË°ˆ Ë°ãÒºˆ¯ÈÎËÓÒ«Óˈ¯Ë­‚ˈ°« Ò det S = −1 ã«°ã‚È«­ÈÏÒ°Ó©²
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