How to Integrate d^2 x or d^3 x in Physics?

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Discussion Overview

The discussion revolves around the integration of higher-order differentials, specifically d²x and d³x, within the context of physics. Participants explore the meaning and application of these integrals, particularly in relation to surface and volume integrals, and express uncertainty regarding their evaluation in specific scenarios.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested, Homework-related

Main Points Raised

  • One participant notes a lack of exposure to integrals of d²x or d³x during their physics education and seeks clarification on their meaning and evaluation.
  • Another participant explains that d²x and d³x represent integrals over a surface or volume, providing the example of \(\int dV = \int d^3x\).
  • A similar point is reiterated by another participant, emphasizing the nonstandard notation and the importance of clarity when communicating these concepts.
  • A participant expresses confusion about evaluating an integral involving a function and questions the origin of specific constants, such as \(2\pi\), in the result they encountered.

Areas of Agreement / Disagreement

Participants generally agree on the interpretation of d²x and d³x as integrals over surfaces or volumes. However, there is uncertainty regarding the evaluation of these integrals, particularly in specific examples, indicating that the discussion remains unresolved.

Contextual Notes

Participants express limitations in their understanding of the evaluation process for integrals involving higher-order differentials, particularly when specific symbols or constants are not provided. There is also mention of nonstandard notation, which may lead to confusion.

Who May Find This Useful

This discussion may be useful for students or individuals interested in advanced calculus, physics applications involving integrals, or those seeking clarification on the notation and evaluation of higher-order differentials.

Steve Drake
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Hi Guys,

Ive gone through a 3 year physics degree but can't remember ever touching on this? I am doing some work and some of the theory contains integrals of d2x or d3R for instance. I have no idea how to do these.

Any help?

Thanks all
 
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They represent integrals over a surface or volume.

Example:
[tex] \int dV=\int d^3x[/tex]
 
Cyosis said:
They represent integrals over a surface or volume.

Example:
[tex] \int dV=\int d^3x[/tex]

...but rather nonstandard notation, so you should make sure your reader knows what you mean if you ever write it...
 
Thanks guys, i thought it had something to do with that. I am still not sure how to evalute one when no symbols are given. Eg I have this function

[tex]\int[/tex] e[tex]^{-abcd}[/tex] d3c

and somehow they get

(2pi)3/2[tex]\partial[/tex](bd)

(sorry i suck at latex lol)

where does the 2 pi come from WHAT IS GOING ON

thanks all
 

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