What Does the Notation \(\frac{\partial u}{\partial t}(x,0)\) Indicate in PDEs?

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Discussion Overview

The discussion centers on the interpretation of the notation \(\frac{\partial u}{\partial t}(x,0)\) in the context of partial differential equations (PDEs). Participants are exploring the implications of differentiating with respect to time at a specific point and the order of operations involved in this notation.

Discussion Character

  • Conceptual clarification, Debate/contested

Main Points Raised

  • One participant questions whether \(\frac{\partial u}{\partial t}(x,0)\) should be interpreted as first differentiating \(\frac{\partial u(x,t)}{\partial t}\) and then setting \(t=0\).
  • Another participant suggests that if \(t\) is set to \(0\) before differentiating, the result may not be meaningful.
  • A third participant expresses a desire for confirmation regarding the interpretation of the notation, indicating a cautious approach to the topic.
  • A later reply acknowledges the previous point positively, suggesting agreement on the importance of clarity in this context.

Areas of Agreement / Disagreement

The discussion reflects uncertainty regarding the correct interpretation of the notation, with differing views on the implications of the order of operations. No consensus has been reached.

Contextual Notes

Participants have not fully explored the implications of their interpretations, and there may be assumptions about the behavior of \(u(x,t)\) that are not explicitly stated.

yungman
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What is the meaning of \;\;\frac{\partial u}{\partial t}(x,0)

Is it equal to \;\;\frac{\partial u(x,t)}{\partial t}\;\;first\;then\;set\;t=0

or \;\;\;\frac{\partial u(x,0)}{\partial t}\;\; Which is setting t=0 in u(x,t) first then differentiate?
 
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Well, if you set t=0 and then differentiate with respect to t, you're not going to get much...
 
Lord Crc said:
Well, if you set t=0 and then differentiate with respect to t, you're not going to get much...

Thanks

I just want to make double sure. Don't want to take anything for granted.
 
Good point :)
 

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