Асимптотические оценки. Мицик М.Ф. - 15 стр.

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( )
( )
( )
+
=
2
1
0
0
1
2
00
λ
λ
π
θλ
O
zS
eezf
izS
.
 8.
( )
( )
=
λϕ
π
λ
π
ϕϕλ

2
1
2
0
sin
deJ
ni
n
. 
.

ϕi
ez =


( )
1
1
1
2
2
1
+
=
=
n
z
z
z
n
z
dz
e
i
J
λ
π
λ
.

)(zS
32
1
)(,
1
1
2
1
)(,
1
2
1
)(
z
zS
z
zS
z
zzS =
+=
=
.

( )
( )
0112Re)(Re
2
=== zxzSzS
k
,  

iz ±=
2,1
, 
1=z

0
=
x
. 
 2, 
. 
)(Re zS
,

4
4
3
21
π
θ
π
θ ==
.

( )
+
=
2
1
1
42
cos
2
λ
ππ
λ
πλ
λ O
n
J
n
.
.

 ()
.
, , 
, , 
.

.
                                   2π                − 12  
= f ( z 0 )e   λS ( z0 ) iθ0
                      e                         1 + O λ   .
                                λ S ′′( z 0 ) 
                                              
                                                            
                                                               
             8.
                                               2π
                               J n (λ ) =
                                           1        i (λ sin ϕ − nϕ )

                                          2π   ∫e
                                               0
                                                                        dϕ              λ →∞

                                                                                             .
                                               .
                                                                   z = e iϕ

                                                                   λ 1 
                                                                     z− 
                                     J n (λ ) =
                                                 1                             dz
                                                            ∫e
                                                                   2 z 

                                                2π i        z =1
                                                                              z n+1 .
                                                                   S (z )
                                1    1             1    1                  1
                   S (z) =        z −  , S ′( z ) = 1 + 2  , S ′′( z ) = − 3 .
                                2    z             2   z                  z
                                                            (
                         Re S ( z ) = Re S (z k ) = x 2 1 − 1 z
                                                                         2
                                                                             )= 0 ,
               z1, 2 = ± i ,                                            z =1                 x = 0.
        2,
                                     .                                                                Re S ( z ) ,
                          3π             π
                  θ1 =           θ2 =      .
                           4             4


                                                     π n π      − 12  
                               J n (λ ) =
                                           2
                                             cos λ −    −  1 + O λ   .
                                          πλ          2 4            
                                                                            
                           .

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