Is the Binomial Theorem Applicable to All Real Numbers?

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Discussion Overview

The discussion centers on the applicability of the Binomial Theorem to all real numbers, particularly whether it can be extended beyond natural numbers to include fractional powers, such as 1/2. The scope includes theoretical considerations and mathematical reasoning related to infinite series.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant notes that the Binomial Theorem is traditionally useful for natural number powers and questions its applicability to all real numbers.
  • Another participant asserts that the theorem can be extended to all real numbers in the form of infinite series.
  • A request for further elaboration on this extension is made by a participant.
  • A participant introduces the Gamma function as a means to extend the factorial concept from integers to positive real numbers, suggesting a connection to the discussion.
  • It is proposed that the expansion of a+b raised to a fractional power results in an infinite series, implying that such expansions are necessary to accommodate irrational numbers.
  • Participants share links to external resources that may provide additional information on the topic.

Areas of Agreement / Disagreement

There is no clear consensus on the applicability of the Binomial Theorem to all real numbers, as participants present differing views on its extension and the nature of the expansions involved.

Contextual Notes

The discussion includes assumptions about the nature of infinite series and the conditions under which the Binomial Theorem may apply, which are not fully resolved.

prasannapakkiam
I learned the Binomial Theorem a while ago. But it is only now that I think about how it is only useful for powers that are natural numbers. Can it be extended to all real numbers - e.g. 1/2?
 
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Yes, but in the form of infinite series.
 
Can you please expand on this?
 
Do you know about the Gamma function that extends the domain of the factorial from the integers to the positive real line?
 
The expansion of a+b raised to a fractional power takes the form of the sum of an infinite number of terms, or more like the limit of a sum as you add more terms. What else could be expected anyway? An expansion of any sort has to be an infinite series to take into account irrational numbers. You can read a bit about it here:

http://www.mathsrevision.net/alevel/pages.php?page=4"
 
Last edited by a moderator:
thanks for the help.
 
This might also help :

http://tutorial.math.lamar.edu/AllBrowsers/2414/BinomialSeries.asp

Werg22's link has pretty much the same thing though, both helpful anyway :)
 
Last edited by a moderator:

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