u , ( ) t, u = u(, t).
, dx , .
dx
=
, F = const ..
=
= ;
, , , n n (t) n ().
= 0
' = 0
0 = ŷFX'
m0p2X = ŷFX'
= 0 = 0; ' = 0 x = l
D = 0; ;
-
n = 1
n = 2
7.4.2.
P(t) (.7.).
. 7.
-
() - .
.
1 2 t.
1, 2
= ,
.
.
f(0) = 0
.
, .
Z ; h ; γ .
- .
,
;