Find some extraordinary subset of [0,1]

  • Thread starter Maclaurin
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In summary, the conversation discusses finding a subset A of [0,1] that satisfies the conditions A=cl(int A) and bd A does not have measure zero, where cl means closure and int means interior. The participants suggest using the fat Cantor set as a starting point and modifying it, ultimately arriving at a set defined as the closure of the union of open intervals omitted at odd steps. Clarification is given on the definition of "boundary" in this context.
  • #1
Maclaurin
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Homework Statement


I want to find a subset A of [0,1] such that A=cl(int A) and bd A does not have measure zero where cl means closure and int means interior.

Homework Equations





The Attempt at a Solution



I tried some sets, but failed.
 
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  • #3
I tried that set but it was difficult for me to modify it. Can you give me more hint?
 
  • #4
Well, you want the fat Cantor set to be the boundary of the set you want.

Every step you leave out some open intervals. Now let V be the union of the open intervals you leave out at the odd steps. Take [itex]\overline{V}[/itex] to be your set.
 
  • #5
I think bd of V is not the fat Cantor set... what should I do?
 
  • #6
ah instead of bd of V, boundary of closure of V.
 

FAQ: Find some extraordinary subset of [0,1]

What is the definition of an extraordinary subset in the context of [0,1]?

An extraordinary subset in the context of [0,1] refers to a subset of the interval [0,1] that possesses unique or exceptional characteristics. This can include subsets with specific patterns, properties, or behaviors that are uncommon or unexpected.

How do you determine if a subset of [0,1] is extraordinary?

Determining if a subset of [0,1] is extraordinary often involves analyzing its elements, properties, and relationships to other subsets. This can be done through mathematical calculations, statistical analysis, or other scientific methods depending on the specific subset in question.

Can an extraordinary subset of [0,1] have infinite elements?

Yes, an extraordinary subset of [0,1] can have infinite elements. In fact, some of the most interesting and extraordinary subsets in this interval have infinite elements, such as the Cantor set which has uncountably infinite elements and unique self-similarity properties.

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