I am trying to understand the following proof:
What I dont't understand is how $\delta(t,x)$ is differentiated. My first thought was to use
But I am not sure if I am on the right track here.
Many thanks in advance!
2026-04-04 04:04:25.1775275465
Question about proof of Liouville' thm. about volume preserving diffeomeorphsims
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