extermal is a weak minimum proof

craig11

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Joined
Feb 5, 2008
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Prove that the extermal y = y1x/x1 corresponds to a weak minimum of both functional integ(0->x1) dx/y' and integ(0->x1) dx/y'^2 where y(0)=0, y(x1)=y1, x1>0, y1>0.

I'm not sure how to prove this, any help would be great
 
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