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, 0.
lim n ¥ xn = 0 " e>0 $ N: " n>N |xn| < e Þ xn.
: xn = 1/n .
, . xn , " c> 0 $ N: " n>N |xn|>c.
. n, 2 n .
1. a n , 1 / a n .
23. an = 1/n, , b n = 1/a n = n .
1. .
2. .
3. .
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5. , , , - .
1. .
.
f(x) , ¥, +¥ -¥, .
: 1) f(x) = tgx x→0.
2) f(x) = ln (1+x) x→0.
. .
- , . , f(x), 0, . , x0, > 0 δ = δ () > 0, ≠ 0 , | - 0 | < δ, |f(x)| > M. :
: :
1. f (x) x → x 0, x → x 0.
2. α (x) x → x 0 " x Î O (x 0) α (x) ≠ 0, x → x0.
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an , , .