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About convex hull and fixed point

  1. Oct 24, 2007 #1
    First, I wonder whether I can put the post here...


    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...

    What if we have a(x)={y in X:||y-x||>=1/2}? (My answer is x=1/2 or y=1/2)

  2. jcsd
  3. Oct 24, 2007 #2


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    What is the definition of convex hull? Of fixed point?
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