X, q Y, R . , U (x, ) , ( ) , Y. , (, ), , .. + qy £ R.
. U (x, y), , q R
{ + qy £ R, x ³0, y ³0} (1.1.6)
( *; *). *; * , q R: * = xD (p,q,R), y * = yD (p,q,R).
.
, .
t > 0 :
xD (tp, tq, tR)= xD (p, q, R), yD (tp, tq, tR)= yD (p, q, R).
, 0. , :
px 'p+ qx 'q+ Rx 'R= 0, py 'p+ qy 'q+ Ry 'R= 0, (1.1.7)
:
+ q+ R= 0, + q+ R= 0.
:
L(,) = U(x,y) + l (R qy).
( -) L(x,) :
U ' x(,) l = 0, U'y(x,y) l q = 0,
(Rpx qy)= 0, (1.1.8)
l ³ 0.
U'x > 0 U'y > 0 ( ), l .
U ' x(,) / U'y(x,y) = / q,
x + qy= R. (1.1.9)
(1.1.9) . : , .
p 1.1.4. xD, yD
U(x,)= ln + ln ln(x + ).
. :
(1.1.9)
U'x / U'x=y 2 / x 2 = p/q,
x + qy= R.
:
. q(x'q + 'R).
qx'q = ' R'R, (1.1.7),
qy = R , + qy = R,
q(x'q + 'R) = px'p ´ 'R = (px'p + ) + (1 'R) =
= (R )'p + x(R )'R = qy'p + xqy'R.
q, :
'q +'R ='p +'R. (1.1.10)
R / xy.
b-1 Eq + ExR =a-1 Eyp + EyR,
q, yp , ExR, ER , a =/R, b =qy/R Y R..
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