. . , , =() ′, ′′,, ⁿ, ..
F(, , ′, ′′,, ⁿ) = 0.
. . , .
.
. (.. ), ′ = f().
:
= ∫f()d
= F() + .
. . F(; ; ′, ′′) = 0, = () , ′ = ′()
′′ = ′′() , F ; ; ′, ′′.
. . ′′ + ′ + q = f() (1), q , . . .
f()≡0, (1) .
. . , λ² + pλ + q = 0.
′′ λ², ′
λ, q 1.
, λ1 λ2.
:
λ1 ≠ λ2 ., . | λ1 = λ2 = λ | λ1,2 = α βi ., . |
0 = 1 λ1 + 2 λ2 | 0 = (1 + 2) λ | 0 = αx(1cosβx + 2sinβx) |
.
.
.
, .
n
∑ pi = 1.
I=1
, , ..
n
= ∑ xipi
i=1
.
:
= (2) ()2
.
n, nN, 1+2+ +n + ∞
∑ n
n = 1
1, 2, n ,
, .. n - ,
S1 = 1, S2 = 1+2, ., Sn = 1+2+ +n .
|
|
, , . . , , .
n ( ), .
, n S.
p > 1 0 < p ≤ 1.
.
, .
, .
.
∞ ∞
∑ n ∑n : N
n=1 n=1
0 ≤ n ≤ n n ≥N.
, n , n .
n , n .
:
, ;
, ;
, ;
, ;
, , ;
, ;
, ;
, .