Understanding Summation Series: Finding Patterns in Sums of Squares

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Discussion Overview

The discussion revolves around the evaluation of the summation series of squares, specifically the series (1^2) + (2^2) + ... + (k^2). Participants explore methods of deriving patterns in summation series, share resources, and discuss geometric proofs related to the topic.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • One participant inquires about evaluating the sum of the series (1^2) + (2^2) + ... + (k^2) and expresses curiosity about finding patterns in summation series.
  • Another participant shares links to resources on discrete calculus and generating functions, suggesting these may provide additional insights.
  • A geometric proof is mentioned, with a participant expressing admiration for its elegance and questioning the existence of similar proofs for more complex series.
  • Further contributions include references to a book titled "Proof Without Words" that contains geometric proofs, with participants sharing examples from the book.
  • One participant notes a potential typo in a shared resource, indicating a collaborative effort to refine the information being discussed.

Areas of Agreement / Disagreement

Participants generally agree on the interest and value of geometric proofs and the resources shared, but there is no consensus on the applicability of such proofs to more sophisticated series, as this remains a point of inquiry.

Contextual Notes

Some participants express uncertainty about the complexity of proofs for advanced series, indicating that the discussion may be limited by the participants' current understanding of the topic.

Who May Find This Useful

This discussion may be of interest to those studying summation series, discrete calculus, or geometric proofs, as well as individuals looking for resources to deepen their understanding of these mathematical concepts.

jobsism
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Sum of 1^2 +2^2 +...k^2

How do you evaluate the sum of the series:-

(1^2) + (2^2)+...(k^2) ?

I do know how to prove that the sum is k(k+1)(2k+1)/6 by induction, but I'm just curious: how do you figure out the pattern for this, and other similar summation series?
 
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micromass said:
homepages.math.uic.edu/~kauffman/DCalc.pdf

Hey, thanks a lot! This is amazing. (The second link will take more time to digest, of course.)

If you are the author, you may want to fix a typo (I think) at the bottom of page 3, where 12n^{\underline 3} becomes 8n(n-1)(n-2) instead of 12n(n-1)(n-2).
 


Thanks you, micromass and Tobias Funke! :D

I didn't even know that there was a branch of mathematics called generatingfunctionology! I didn't read much of it, but I intend to. The article on Discrete Calculus was more interesting, but it's taking some time to get used to it. Can you suggest some introductory books for it, to gain practice?

That geometric proof was simply marvellous, but such proofs can't exist for more sophisticated series, can it?
 


jobsism said:
That geometric proof was simply marvellous, but such proofs can't exist for more sophisticated series, can it?

There are these series of books out there labeled Proof Without Words by Roger B. Nelsen which are FILLED with similar examples to this type of problem. They don't provide the proof, that's left up to you, but all of the content is viewed geometrically.

I've attached three "proofs"from the book that I thought were interesting.
 

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Those proofs are amazing! Thanks, scurty! I'll check out that book.

The third one reminded me of the Sierpinski fractal. :D
 


this is explained in a footnote on page 27 of courant's calculus.
 

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