, .
1. . 1.2,
(1.89)
,
(1.90)
, ,
(1.91)
.
G Ì Rn , , S - , - . , G x (1.91) (1.91). (1.89) (1.90) T =G ´ (0,T) T G. S ´[,T] : (. 1.3).
, r, p, q (1.89) - (1.91) t; ,
r(x) > 0, p(x) > 0, q(x)³ 0
, (1.89)-(1.91) ,
|
1.2, , , , , ( ) , ( ). . , n - n . , , ; , , x, y u(x,y)=f(y), f - 2. , , . : . . , , .
) : , G Rn, .
) : S, , , .
|
|
) : , ,
G¹Rn
(1.89) (1.91).
2. . (1.89) ( ) : u(x,t) C2(t > 0) Ç Cl(t ³0), (1.89) t > 0
t = +0
(1.92)
, FÎC(t > 0), u0Î1(Rn), u1Î(Rn).
(1.90) ( ) : u(x,t) 2(t > 0)Ç C(t ³ 0), (1.90) t > 0 t = +0
(1.93)
, FÎC(t > 0), u0Î(Rn),
. :
(1.94)
- S= {t= s(x)} u0 u1 S ( ). (1.94) u(x,t), t>s(x), S, S :
(1.95)
n S, t (.9).
(1.94), (1.95), S (. 1.3, . 3) (1.94). , .
. 1 . , , . , , , (1.90) (1.91) I . , , . , (1.89) (1.92) :
(1.96)
(16) :
(1.97)
5. . , .
) . (. 1.3, . 4):
(1.98)
a, b :
(,) (1.98) (. 1.4) :
(1.99)
|
:
, (1.98).
|
|
) .
:
(1.100)
(1.100) (. 1.3, . 5),
|
G (x, ) = 0 : G1(y > 0) G2(y < 0). , g1 > 0 - So, x1 2, 1 < 2, x, a G2 < 0 S1 S2 (1.100) (. 1.3, . 5), 1 x2 (. 1.5).
(,) (1.100) g1 G2 So , , S1, :
(1.101)
,
6. . , .
) - M1.
) - 2.
) ( , , . .).
D : Dk, k = 1,2,..., - D, k → ∞, k, k= 1,2,..., ; uk → u, k → ∞ . , Lu = F, L , N, N . F , L-l N (. 1.1, .8,9). , , , , , .
, , ( ), M1∩M2 . , ) - ), .
: , (, , ..).