Vector Spaces: Real Numbers Over Rational Numbers

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SUMMARY

The discussion focuses on identifying a basis for the infinite-dimensional vector space of real numbers (R) over rational numbers (Q). It establishes that any basis must be uncountable due to the uncountability of real numbers compared to the countability of rational numbers. The conversation suggests the possibility of constructing a function over the interval [0, 1] that could define a basis element for this vector space, emphasizing the complexity of the task.

PREREQUISITES
  • Understanding of vector spaces and their properties
  • Familiarity with the concepts of countability and uncountability
  • Knowledge of real numbers and rational numbers
  • Basic understanding of functions and their mappings
NEXT STEPS
  • Research the concept of bases in vector spaces, specifically in infinite dimensions
  • Explore the implications of countability and uncountability in set theory
  • Learn about constructing functions over intervals, particularly in real analysis
  • Investigate existing mathematical frameworks for defining bases in infinite-dimensional spaces
USEFUL FOR

Mathematicians, students of advanced algebra, and anyone interested in the theoretical aspects of vector spaces and their bases.

arunkp
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Please tell me one of the bases for the infinite dimenional vector space - R (the set of all real numbers) over Q (the set of all rational numbers). The vector addition, field addition and multiplication carry the usual meaning.
 
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Why do you think there is one you can describe constructively?
 
It's not JUST "infinite dimensional". Since the set of real numbers is uncountable, while the set of rational numbers is countable, any basis for the real numbers, as a vector space over the rational numbers, would have to be uncountable- so it is impossible to list them.

Theoretically, you could set of a function, say over [0, 1], such that f(x) for each x gives a "basis" number. If you figure out how to do that, please let me know!
 

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