Real Integral Solutions: Exact vs Approximations

  • Context: Graduate 
  • Thread starter Thread starter darkside00
  • Start date Start date
Click For Summary

Discussion Overview

The discussion revolves around the nature of real integral solutions, specifically whether every real integral can be solved exactly or if approximations are necessary. It touches on the use of series and functions in defining solutions and the potential limitations of these methods.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • Some participants question whether it is possible to solve every real integral exactly or if approximations, such as series or sequences, are required.
  • One participant clarifies that Taylor series are exact representations of analytic functions within their radius of convergence, though truncating them can lead to approximations.
  • Another participant suggests that all series can be expressed as functions within their convergence limits.
  • A further point is raised about the possibility of defining functions analytically without resorting to series expansions, with a suggestion that some functions may only be defined through such expansions.
  • There is a call for a more precise formulation of the question regarding the establishment of functions as non-series.

Areas of Agreement / Disagreement

Participants express differing views on the necessity of series expansions for defining functions, indicating that there is no consensus on whether all real integrals can be solved exactly or if approximations are essential.

Contextual Notes

Some limitations in the discussion include the need for clearer definitions of terms like "actual solution" and "non-series," as well as the dependence on the context of convergence for series representations.

darkside00
Messages
83
Reaction score
0
Is is possible to solve every real integral and come up with an actual solution? perhaps we may have not just found the methods of doing so. Or is it a must to use approximations(series/sequences) to do so?
Or is there a way to reverse numerical numbers to come up with a function?
 
Physics news on Phys.org
It really depends on what you mean by "actual solution".

Taylor series aren't approximations, by the way. You can truncate the series after a finite number of terms to produce an approximation, but the Taylor series itself is an exact representation of an analytic function -- at least within its radius of convergence.
 
right. I guess all series can be expressed as functions with n to infinite within its convergence.

So, perhaps the real question is could we establish functions as a non series, or do we need them?
 
Last edited:
I think you need to formulate a precise question. What do you mean by "establish functions as a non series"?
 
I think what he means is to define a function analytically without using a series expansion, and I believe the answer you are looking for is that, short of defining a function as the integral of another function(for example, the logarithmic integral function), we currently cannot define some functions short of a series expansion.
 

Similar threads

Replies
2
Views
2K
  • · Replies 3 ·
Replies
3
Views
2K
Replies
7
Views
3K
  • · Replies 24 ·
Replies
24
Views
7K
  • · Replies 24 ·
Replies
24
Views
2K
  • · Replies 11 ·
Replies
11
Views
3K
  • · Replies 53 ·
2
Replies
53
Views
7K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 5 ·
Replies
5
Views
2K