What is the Inverse of a Differential Operator?

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    Differential Inverse
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Discussion Overview

The discussion revolves around the definition and meaning of the expression \(\frac{\partial{}}{\partial{z_{\mu}}}\) in the context of differential operators, particularly in relation to the partial derivative defined by \(z_\mu = \frac{\partial{\phi}}{\partial{x^{\mu}}}\). Participants explore whether this expression can be considered an inverse of a differential operator and seek clarification on its calculation and interpretation.

Discussion Character

  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant proposes that \(\frac{\partial{}}{\partial{z_{\mu}}}\) could be considered an inverse of a differential operator and seeks to understand its meaning.
  • Several participants argue that \(\frac{\partial{}}{\partial{z_{\mu}}}\) is simply a partial derivative and not an inverse of anything.
  • There is a suggestion that without a specific function of \(z_\mu\) for the operator to act upon, the expression lacks meaning or a calculable value.
  • Another participant compares the question to asking for the value of the square root operator without a number to operate on.

Areas of Agreement / Disagreement

Participants generally disagree on whether \(\frac{\partial{}}{\partial{z_{\mu}}}\) can be considered an inverse of a differential operator. The discussion remains unresolved regarding its interpretation and calculation.

Contextual Notes

Participants note that the expression's meaning is contingent upon the context in which it is applied, specifically the absence of a defined function for the operator to act upon limits its interpretability.

laguna
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Hello everybody,
If I define z_\mu = \frac{\partial{\phi}}{\partial{x^{\mu}}}, \, \mu = 0,1,...,n, (for some scalar function phi of x=(x_0,...,x_n)) how is then \frac{\partial{}}{\partial{z_{\mu}}} defined or rather what is it equal to? How would you call this expression? the inverse of a differential?

Thank you.
 
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It is not an inverse of anything. It is a partial derivative.
 
mathman said:
It is not an inverse of anything. It is a partial derivative.
What is it equal to or how can i calculate it please?
 
laguna said:
How would you call this expression?

Thank you.

The expression is a differential operator. Unless you state a specific function of ##z_\mu## for it to operate upon, there is nothing to calculate.
 
laguna said:
Hello everybody,
how is then \frac{\partial{}}{\partial{z_{\mu}}} defined or rather what is it equal to?

laguna said:
What is it equal to or how can i calculate it please?
As already explained, it's an operator. By itself, without a function for it to operate on, it has no meaning. Your question is similar to "What is ##\sqrt{}## equal to?
 

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