(, , .) , . . , . . , u (t) ( ), (), , . . .
. 9.5, .
. 9.5. () ()
, , . . sin /. f 01, f 02, f0m = m/t (m = 1, 2, 3,...). , 0, f 01, f 02, . , →∞ (. 9.5, ).
, , . , , . 9.5, . (-) . - (. 9.5, ) , . 9.6.
. 9.6. -
( ) , , , . , ( ), Δ F. , . . 9.6, , 0... f 01. . () Δ F = f 01 = 1/t . Δ F = (23)/ t