8.
.
D (s) , .. D (jw) w 0 ¥.
.
. 1938 . .. D (s). s jω.
.
- , D (s), s, - , D (s) s.
D (jω) ( 1-5 . 7.4). .
. n- , D(jw) w 0 ¥ nπ/2
, , D(jw) ( ), , , n , n - .
. 7.4 1 , 3, 4 5 .
( 2 . 7.4).
, ω, D (jω) = 0, .. . , .. . , D (jω) . 7.4 , , .
D (jω) . ,
, D (jω) , . . D (jω) , ω .
, ω, D (jω) , .. , . , , ω, ω = 0, = 0, > 0.
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