X=[0,1]^2(adsbygoogle = window.adsbygoogle || []).push({});

a(x)={y in X:||y-x||>=1/4}

b(x)is the convex hull of a(x).

Identify the set of fixed points.

My answer is 3/4>=x>=1/4, 3/4>=y>=1/4, but I am not sure...

Thanks.

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# Homework Help: About convex hull and fixed point

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