Understanding Theorems: Open Mapping & Closed Range

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Discussion Overview

The discussion centers around the open mapping theorem and the closed range theorem, with participants seeking clarification and examples to better understand these concepts. The scope includes theoretical definitions and potential applications in mathematical analysis.

Discussion Character

  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • Miss. Lolitta expresses a need for a comprehensive lecture on the open mapping theorem and the closed range theorem, indicating previous resources were unclear.
  • One participant provides definitions of open and closed mappings, explaining that an open mapping sends open sets to open sets, while a closed mapping sends closed sets to closed sets, but expresses uncertainty about the specific theorems mentioned.
  • Another participant shares links to external resources for further reading on the open mapping theorem and the closed range theorem.
  • A later reply humorously suggests that the participant might as well send tuition money to Wikipedia instead of their university, implying a reliance on online resources for understanding these theorems.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the clarity of the theorems, with some expressing confusion and others providing definitions and resources. The discussion remains unresolved regarding a comprehensive understanding of the theorems.

Contextual Notes

Limitations include the lack of detailed explanations or examples of the theorems themselves, as well as varying levels of familiarity with the concepts among participants.

Miss_lolitta
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Miss. Lolitta says:

Hello everybody here :smile:

Can someone give me a complete lecture-that has introduction & examples and explaining-for

"the open mapping theorem" and "the closed range theorem"

actually I read some books about this theorem but they weren't clear for me:bugeye:

please,help me to figure out this theorem..

Thanks in advance
 
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Hi,

I'm not familiar with the theorems, but I can give a few definitions:

f is an open mapping if for all open sets O in the domain, f(O) is open in the range. In other words, f maps open sets to open sets.

f is a closed mapping if for all closed sets C in the domain, f(C) is closed in the range. In other words, f maps closed sets to closed sets.

I'm not sure what theorems you are talking about.
 
thanks sooooooo much
 

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