> > .
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2.4. z-

z, -

8 2.1 2.2 (2.2), (2.18). (2.19), (2.21) - u(t) , :

( ) (2.24), , (2.22), (2.23) - - [6]. . 2.1 - .

- -, (2.1):

2.1

Z (2.22).

1.3, , (, . 1.16, 1.17). , . . - , (2.22), . u(t). - - , (2.21), , , . .

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