Can Every Compact Metric Space Have a Countable Base?

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Homework Help Overview

The discussion revolves around the question of whether every compact metric space has a countable base, as posed in a problem attributed to Rudin. Participants are examining the implications of definitions related to countability in the context of compact metric spaces.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants are questioning the validity of the statement regarding compact metric spaces and countable bases, particularly in relation to the definitions of countability and finiteness. There is a focus on whether a finite compact metric space can indeed have a countable base.

Discussion Status

The discussion is exploring different interpretations of countability as defined by Rudin, with some participants suggesting that the distinction between finite and countable sets is crucial to understanding the problem. There is an ongoing examination of how these definitions impact the original statement.

Contextual Notes

Participants note the importance of clarifying Rudin's definitions of countable and finite sets, as this may influence the validity of the statement regarding compact metric spaces.

imahnfire
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Rudin's problem asks: Prove that every compact metric space K has a countable base.

My concern is how valid this statement really is. Wouldn't a finite compact metric space be unable to have a countable base?
 
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Rudin probably defines countable as either finite or in bijection with \mathbb{N}. So finite things are countable to him.

You should look up his definition to be sure.
 
Rudin distinguishes finite sets and countable sets in his book. Would this affect the validity of the statement?
 
imahnfire said:
Rudin distinguishes finite sets and countable sets in his book. Would this affect the validity of the statement?

Yes, it does. You want the base to be either finite or countable.
 

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