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FindMinimum Problem


Hi, all,
    recently I am dealing with a problem as following, findminimum(over x)
of a function f[a[0],x], where a[z] satisfies a differential equation
a'[z]=x*z say. The code is like:
FindMinimum[x^2-a[0]*x/.NDSolve[{a'[z]==x*z,a[1]==1},a,{z,0,1}],{x,-1,1}]

the problem is that I can do it in mathematica 4.2, but can't in mathematica
5.0 now. Do anybody where is the problem?

thanks,

Jiang



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