2. ; , , . : ( ) .
, . , : V = * , (q) , q + p + k ( ) . , q, p, k , .
. , , . , , , .
, 2 + I2 = 2I, :
V = * * , , .
, , 2 + Br2 = 2Br , V =
. .
Br2 = 2Br
Br + 2 = Br +
+ Br2 = Br + Br
+ Br = 2 + Br
Br + Br = Br2
, , .
6 . , . .
, . , (, , ) .
, . .