Mathematics for Economists

(Greg DeLong) #1

Calculus of variations


Example


Find the extremal of
Ze

1

x


y^0

 2


+yy^0 dx,y( 1 )= 0 ,y(e)= 1.

The EulerñLagrange equation is

y^0 =

d
dx


x 2 y^0 +y




= 2 y^0 +x 2 y^00 +y^0
0 = y^0 +xy^00.
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