Adding 0 to 1: What is the Sum?

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Discussion Overview

The discussion revolves around the question of what the sum of all numbers between 0 and 1 is, exploring various mathematical interpretations and implications. Participants engage with concepts from calculus, series, and the nature of infinity, examining whether such a sum can be defined or calculated meaningfully.

Discussion Character

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

Main Points Raised

  • Some participants suggest that adding all numbers between 0 and 1 leads to infinity, particularly when considering the real numbers or rationals.
  • Others argue that the divergence of the harmonic series supports the idea that summing an infinite set of numbers results in infinity.
  • A few participants express confusion about why the p-series diverges for p=1, questioning the intuitive understanding of convergence.
  • One participant proposes that the sum of an uncountably indexed set of positive real numbers must yield infinity, using partitioning arguments to support this claim.
  • Some participants emphasize the importance of defining the type of numbers being summed before making any conclusions.
  • There are discussions about the order of summation affecting the result, with examples provided to illustrate how different arrangements can yield different sums.
  • Several participants express uncertainty about the validity of the original question, suggesting it lacks clarity or a defined method of summation.

Areas of Agreement / Disagreement

Participants generally do not reach a consensus on the question posed. There are multiple competing views regarding the nature of the sum and whether it can be meaningfully defined, with some arguing for divergence and others questioning the premise of the question itself.

Contextual Notes

Limitations include the lack of clarity on what is meant by "adding all numbers between 0 and 1," as well as the dependence on definitions of convergence and summation methods. The discussion also highlights unresolved mathematical steps and assumptions regarding infinite series.

  • #31
matt grime said:
Well, it isn't a clear cut question. The first thing to have asked yourself is: *how* do you try to sum all the numbers between 0 and 1. That is to say that there really was a more basic question going on. For instance it *is* possible to sum more than a simple series indexed by the natuarl nubmers.

eg, let w be a symbol and r run from 1 to infinity, then define x(w)_r to be a geometric series of positive terms that sums to 1/2, then x(2w)_r be one that sums to 1/4, then x(3w)_r be oen that sums to 1/8, and so on so that the sequence x(nw)_r sums to 1/2^n

then i claim that this is gives a series indexed by the ordinal w^2 (or something like that) whose sum which we do transfinitely is 1.

However [0,1] is uncountable. so we can't do this. So, it is perfectly reasonable to ask how you thought the sum was going to be taken.

The thought that crossed my mind, in the shower might I add, was that there are a bunch of numbers between 0 and 1, an infinite number of them. If I added them all, do they converge, and if so what do they converge to.

The simplest way to reflect that was to ask it the way I did. Arildno says that my question implies that I'm asking about integers, which is in all honesty a mockery.

It was a 5 second ordeal that was answered in the first 3 posts.
 
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  • #32
Why is it a mockery? You ask a question that makes no sense, so others must attempt to make sense of it. Arildno demonstrated that the question as posted makes no sense by posting one interpretation that shows highlights the absurdity (in the non-insulting sense) of the situation.


"number" is a vague fuzzy term that could mean anything. natural nubmer, whole number, rational number, real nubmer, complex number. Only context makes it make sense, and there is no context for adding up all real numbers (or rational ones for that matter) between 0 and 1.
 

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