Let [tex]u,v\in C^1(R^2)[/tex], and(adsbygoogle = window.adsbygoogle || []).push({});

[tex]

(u)^1+(v)^2=1,\partial_x u+ \partial_y v=0[/tex].

Then [tex]u,v[/tex] are constants.

Is it right? How to prove?

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# Incompressiblitiy and unit length implies constants

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