Is For Only Finitely Many Indices j Justifiable in Compactness Proofs?

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Homework Help Overview

The discussion revolves around a proof related to compactness in topology, specifically addressing the reasoning behind the phrase "for only finitely many indices j" as mentioned in a referenced text. Participants are exploring the implications of this statement within the context of convergent subsequences.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants are attempting to understand the rationale behind the finiteness of certain indices in the proof. Questions are raised about the conclusion regarding the total number of positive integers involved and the relationships between various elements in the proof.

Discussion Status

The discussion is active, with participants seeking clarification on specific statements and exploring the implications of finiteness in the context of the proof. Some guidance has been offered regarding the relationship between finite sets, but no consensus has been reached on the underlying assumptions or conclusions.

Contextual Notes

There appears to be some confusion regarding the interpretation of the proof and the definitions involved, particularly concerning the number of indices and their implications for the overall argument. Participants are navigating these complexities without a clear resolution.

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It means the set of j's such that ______ holds is finite.
 
Sorry, I asked the wrong question. I wanted to ask how do they make the conclusion that there "is a grand total of only finitely many positive integers"?
 
How many y's are there?
How many balls are there?
How many y's per ball?
 
Of course! Finite times finite = finite.
 

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