= AF(x,y),
= Q(x,y),
= AF(x,y),
= Q(x,y),
A >> 1 - . , AF(x,y) - , . , x - . A.
ε = F(x,y),
= Q(x,y),
ε << 1. (ε = 1/A).
, ε → 0 ε = F(x,y) = 0.
, x F(x,y) = 0, x , y, , .. x = x(y).
y , x(y).