Let Determine whether A is open, closed or neither. What is the closure, interior and boundary of A? I was under the impression that the set is neither open nor closed, but am struggling to prove this.
Last edited by Plato; Jun 22nd 2011 at 11:09 AM. Reason: LaTeX fix
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Originally Posted by Cairo Let Determine whether A is open, closed or neither. What is the closure, interior and boundary of A? True or false: Can you show that , the boundary of A.
you might want to consider the following subsets of : {0}x[0,5], {3}x[0,5], [0,3]x{0}, [0,3]x{5}. which of these are entirely in A?
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