z=+i

, i

i2 = -1

.

z=+i (,)=Re(z) z=Im(z) z

.

(x,y) , x y .

, .

, .

u , (x,y), (x,y) u=(x,y).

, .

.

, , , . z=+i , (z) (,) =(,) z.

(), .

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