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a b |a + b| = 0, 1,
 

Summary:  Һ
a b и
|a + b| = 0, 1,

2,

3, 2 3
u = (-1, -1, -1, -1) v = (-1, 1, 1, 1) R4
Һ
غ
׺ 180
120
90
60
0
|a + b| = 3 غ cos (u, v) =
u v
|u| |v|
=
-2

  

Source: goston, Istvn - Institute of Mathematics, Etvs Lornd University

 

Collections: Mathematics