. y = f (x) x 0 , , x 0. f (x) x x 0.
. , y = f (x) x 0 , , x 0 , a (. 3.2). .
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lim . .
. , .
a y = f (x) x 0 , > 0 > 0, , x, x 0 , .
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> 0. , a y = f (x) x 0 , , x , f (x) (. . 5.2).
. 5.2.
. 5.2, . , , a y = f (x) x 0.
f (x) x 0 . x, , x 0 .
: . . 5.3 , y = f (x) , x 0 .
. 3.3 , y = f (x), ,
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x 0 ,
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x . y = f (x) x.
a y = f (x) , > 0 S > 0, , x, | x | > S, | f (x) a | < .
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x, S, , S.
(. 5.4).
. 5.4.
. 3.4 , .