Supremum & infimum of the set of all rational numbers

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SUMMARY

The supremum and infimum of the set of all rational numbers between √2 and √3 are defined as √3 and √2, respectively. This conclusion is based on the properties of rational numbers and their density within the real number line. The discussion highlights the application of the Dedekind cut approach to establish these bounds, confirming that while √2 and √3 are not rational, they serve as the infimum and supremum for the set of rational numbers in the specified interval.

PREREQUISITES
  • Understanding of real numbers and their properties
  • Familiarity with rational numbers and their density
  • Knowledge of the Dedekind cut method for defining real numbers
  • Basic concepts of supremum and infimum in mathematical analysis
NEXT STEPS
  • Study the properties of rational numbers and their density in real numbers
  • Learn about the Dedekind cut and its application in real analysis
  • Explore supremum and infimum concepts in various mathematical contexts
  • Investigate the implications of irrational numbers within rational number sets
USEFUL FOR

Mathematicians, students of real analysis, and anyone interested in the properties of rational and irrational numbers.

rohithsen
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Hi everybody,
Please help me to find supremum & infimum of the set of rational numbers between √2 to √3

(ie) sup & inf of {x/ √2 < x < √3 , where x is rational number}
 
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Hi rohitshen! :smile:

If you tell us what you've tried then we'll know where to help! Did you have any guess for what the sup and inf could be?
 
rohithsen said:
Hi everybody,
Please help me to find supremum & infimum of the set of rational numbers between √2 to √3

(ie) sup & inf of {x/ √2 < x < √3 , where x is rational number}
There is an approach to defining real numbers (Dedekind cut) where √2 and √3 would be defined as the inf and sup respectively.
 

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