Construction of the Real Numbers

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Discussion Overview

The discussion centers around recommendations for books that cover the construction of the real numbers, specifically through the lens of Cauchy sequences. Participants explore various resources and approaches to this mathematical concept.

Discussion Character

  • Exploratory, Technical explanation

Main Points Raised

  • One participant requests recommendations for books on the construction of real numbers via Cauchy sequences.
  • Another participant mentions that Rudin's "Principles of Mathematical Analysis" includes a construction of real numbers but notes it uses Dedekind cuts instead of Cauchy sequences.
  • A different participant suggests that Spivak's work includes this construction as an exercise, guiding readers through the basic ideas while leaving some complexities for independent exploration.
  • Another resource mentioned is Terence Tao's lecture notes, which may provide helpful insights into the construction of real numbers.
  • A participant recommends a book by Thurston that specifically addresses the construction of reals using Cauchy sequences.
  • Lastly, "Axiomatic Set Theory" by Suppes is suggested, with a specific page referenced for further exploration.

Areas of Agreement / Disagreement

Participants express differing views on the resources available, with some asserting that certain texts do not use Cauchy sequences while others provide alternative recommendations. The discussion does not reach a consensus on a single recommended resource.

Contextual Notes

Some participants highlight the differences in approaches to constructing the real numbers, indicating a reliance on various mathematical frameworks such as Cauchy sequences and Dedekind cuts, which may lead to differing interpretations and methodologies.

jgens
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Does anyone have or know of any good books that cover the construction of the real numbers via cauchy sequences? I would appreciate any recommendations. Thanks!
 
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rudin doesn't use cauchy sequences - it uses dedekind cuts.
 
Hmm, I think Spivak includes this construction as an exercise. IIRC, he guides you along so you get the basic idea, but the tricky parts such as demonstrating the existence of a multiplicative inverse is left entirely to you. If you want to just read about it, Terence Tao's lecture notes might be helpful:

http://www.math.ucla.edu/~tao/resource/general/131ah.1.03w/week2.pdf
 
Axiomatic Set Theory by Suppes. You can browse through it with Google Books, see page 188.
 

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