Stationary Field: Why Professor and Books Differ

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SUMMARY

The discussion centers on the concept of stationary fields in physics, specifically the distinction between total derivatives and partial derivatives. The professor asserts that a stationary field implies \(\frac{du}{dt}=0\), while the literature clarifies that this condition is represented by \(\frac{\partial u}{\partial t}=0\). The consensus is that a stationary field is defined as one that does not depend on time, leading to the conclusion that \(\partial_t u = 0\) accurately describes this condition.

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ATY
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So, I got a question about stationary field.
In the lecture the professor said, that our field is stationary, so we have \frac{du}{dt}=0, but from what I read in books, it only means, that \frac{\partial u}{\partial t} =0. Who is right and why ?
 
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The total derivative makes no sense unless you have a function of ##t## only. A stationary field is a field that does not depend on ##t## and therefore ##\partial_t u = 0##.
 
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