Impossible Curl of a Vector Field

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Discussion Overview

The discussion centers on the properties and restrictions of the curl of a vector field, particularly when the vector field is not a gradient field. Participants explore theoretical aspects and implications of vector calculus, with a focus on determining the feasibility of specific curl functions.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions the restrictions on the curl of a vector field that is not a gradient field.
  • Another participant suggests that if a vector field is the curl of another vector field, then its divergence must be zero, and notes that this condition is locally reversible.
  • A participant presents a specific curl function, <2x, 3yz, -xz^2>, and asks if it is possible, prompting further inquiry into the validity of this example.
  • One participant proposes examining Fourier transforms to derive results related to the curl, while acknowledging that not all functions possess Fourier transforms.

Areas of Agreement / Disagreement

Participants express differing views on the restrictions of the curl of a vector field, with some agreeing on the divergence condition while others question the specific example presented. The discussion remains unresolved regarding the feasibility of the proposed curl function.

Contextual Notes

Limitations include the potential lack of Fourier transforms for certain functions, which may affect the applicability of that approach in determining properties of the curl.

laplacianZero
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Let's assume the vector field is NOT a gradient field.

Are there any restrictions on what the curl of this vector field can be?

If so, how can I determine a given curl of a vector field can NEVER be a particular vector function?
 
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Can give us a context here or some example that you're looking at?
 
No example in particular... but I guess I can come up with one.

Here

Curl of vector field F = <2x, 3yz, -xz^2>

Is this possible??
 
laplacianZero said:
Are there any restrictions on what the curl of this vector field can be?
sure. if a vector field v is a curl of some another vector field then ##\mathrm{div}\,v=0## Locally the inverse is also true
 
Well, is the above post #3 a possibility?
 
?
 
Nvm. I got it.
 
You can obtain some results concerning that question by examining the Fourier transforms. This approach suffers from the obvious shortcoming that not all functions have Fourier transforms, but anyway, it could be that Fourier transforms still give something.
 

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