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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 . ( ) . , , , , . .