How to prove invariance of I in this system?

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SUMMARY

The discussion focuses on proving that the expression I = log(u) - u + 2log(v) - v is an invariant for the dynamical system defined by the equations ˙u = u(v - 2) and ˙v = v(1 - u). The key conclusion is that demonstrating I-dot equals zero confirms I's status as an invariant. Participants clarify that the task requires showing the time derivative of I remains constant over time.

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Homework Statement


Show that I = log(u)-u+2log(v)-v is an invariant of the following system
[itex] \dot{u}=u(v-2)[/itex]

[itex] \dot{v}=v(1-u)[/itex]

Homework Equations



The Attempt at a Solution


The question was given on a homework assignment, but I have very little idea what it is asking for and even less of an idea of how to solve it.
 
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hi rg2004! :smile:
rg2004 said:
Show that I = log(u)-u+2log(v)-v is an invariant of the following system …

it just means that I-dot is zero :wink:
 

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